Maxim Integrated Semiconductor Electronic Components Datasheet


MAX232

Multichannel RS-232 Drivers/Receivers


MAX232 Datasheet PDF
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MAX220–MAX249
+5V-Powered, Multichannel
RS-232 Drivers/Receivers
General Description
The MAX220–MAX249 family of line drivers/receivers is
intended for all EIA/TIA-232E and V.28/V.24 communica-
tions interfaces, particularly applications where ±12V is
not available.
The MAX225, MAX233, MAX235, and MAX245/MAX246/
MAX247 use no external components and are
recommended for applications where printed circuit
board space is critical.
The MAX220-MAX249 are offered in 26 different pack-
ages with temperatures from 0 to +70°C up to -55°C to
+125°C. See ordering information table at the end of the
data sheet for all package and temperature options.
Applications
Interface Translation
Multidrop RS-232 Networks
Portable Diagnostics Equipment
AutoShutdown and UCSP are trademarks of Maxim Integrated
Products, Inc.
Benefits and Features
Saves Board Space
Integrated Charge Pump Circuitry
Eliminates the Need for a Bipolar ±12V Supply
Enables Single Supply Operation from +5V Supply
Integrated Capacitors (MAX223, MAX233, MAX235,
MAX245-MAX247)
Saves Power for Reduced Power Requirements
5µW Shutdown Mode
Ordering Information and Selection Table appears at end
of data sheet.
MAX220/MAX232/MAX232A Pin Configuration and Typical Operating Circuit
TOP VIEW
+
C1+ 1
V+ 2
C1- 3
C2+ 4
C2- 5
V- 6
MAX220
MAX232
MAX232A
T2OUT 7
R2IN 8
16 VCC
15 GND
14 T1OUT
13 R1IN
12 R1OUT
11 T1IN
10 T2IN
9 R2OUT
DIP/SO
CAPACITANCE (μF)
DEVICE C1 C2 C3 C4 C5
MAX220 0.047 0.33 0.33 0.33 0.33
MAX232 1.0 1.0 1.0 1.0 1.0
MAX232A 0.1 0.1 0.1 0.1 0.1
+5V INPUT C3
C1
C2
TTL/CMOS
INPUTS
C5
16
1 C1+
3 C1-
4 C2+
5 C2-
VCC
+5V TO +10V
VOLTAGE DOUBLER
+10V TO -10V
VOLTAGE INVERTER
V+ 2 +10V
V- 6 -10V
C4
+5V
400kΩ
11 T1IN
T1OUT 14
+5V
400kΩ
10 T2IN
T2OUT 7
RS-232
OUTPUTS
TTL/CMOS
OUTPUTS
12 R1OUT
9 R2OUT
R1IN 13
5kΩ
R2IN 8
5kΩ
GND
15
RS-232
INPUTS
19-4323; Rev 17; 1/15


MAX232 Datasheet PDF
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MAX220–MAX249
+5V-Powered, Multichannel
RS-232 Drivers/Receivers
Absolute Maximum Ratings—MAX220/222/232A/233A/242/243
(Voltages referenced to GND.)
VCC ...........................................................................-0.3V to +6V
V+ (Note 1) ..................................................(VCC - 0.3V) to +14V
V- (Note 1) ..............................................................+0.3V to -14V
Input Voltages
TIN .............................................................-0.3V to (VCC - 0.3V)
RIN (Except MAX220) ........................................................±30V
RIN (MAX220) ....................................................................±25V
TOUT (Except MAX220) (Note 2) ......................................±15V
TOUT (MAX220)..............................................................±13.2V
Output Voltages
TOUT..................................................................................±15V
ROUT........................................................-0.3V to (VCC + 0.3V)
Driver/Receiver Output Short Circuited to GND.........Continuous
Continuous Power Dissipation (TA = +70°C)
16-Pin Plastic DIP (derate 10.53mW/°C above +70°C)..842mW
18-Pin Plastic DIP (derate 11.11mW/°C above +70°C)..889mW
20-Pin Plastic DIP (derate 8.00mW/°C above +70°C) ..440mW
16-Pin Narrow SO (derate 8.70mW/°C above +70°C) ...696mW
16-Pin Wide SO (derate 9.52mW/°C above +70°C)......762mW
18-Pin Wide SO (derate 9.52mW/°C above +70°C)......762mW
20-Pin Wide SO (derate 10.00mW/°C above +70°C)....800mW
20-Pin SSOP (derate 8.00mW/°C above +70°C) ..........640mW
16-Pin CERDIP (derate 10.00mW/°C above +70°C).....800mW
18-Pin CERDIP (derate 10.53mW/°C above +70°C).....842mW
Operating Temperature Ranges
MAX2_ _AC_ _, MAX2_ _C_ _ .............................0°C to +70°C
MAX2_ _AE_ _, MAX2_ _E_ _ ..........................-40°C to +85°C
MAX2_ _AM_ _, MAX2_ _M_ _ .......................-55°C to +125°C
Storage Temperature Range .............................-65°C to +160°C
Lead Temperature (soldering, 10s) .................................+300°C
Soldering Temperature (reflow)
20 PDIP (P20M+1) .......................................................+225°C
All other lead(Pb)-free packages.................................+260°C
All other packages containing lead(Pb) ......................+240°C
Note 1: For the MAX220, V+ and V- can have a maximum magnitude of 7V, but their absolute difference cannot exceed 13V.
Note 2: Input voltage measured with TOUT in high-impedance state, VSHDN or VCC = 0V.
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
Electrical Characteristics—MAX220/222/232A/233A/242/243
(VCC = +5V ±10%, C1–C4 = 0.1µF‚ MAX220, C1 = 0.047µF, C2–C4 = 0.33µF, TA = TMIN to TMAX‚ unless otherwise noted.) (Note 3)
PARAMETER
CONDITIONS
MIN TYP MAX UNITS
RS-232 TRANSMITTERS
Output Voltage Swing
Input Logic-Low Voltage
Input Logic-High Voltage
Logic Pullup/lnput Current
All transmitter outputs loaded with 3k to GND
All devices except MAX220
MAX220: VCC = +5.0V
All except MAX220, normal operation
VSHDN = 0V, MAX222/MAX242, shutdown,
MAX220
±5 ±8
1.4
2 1.4
2.4
5
±0.01
0.8
40
±1
V
V
V
μA
Output Leakage Current
Data Rate
Transmitter Output Resistance
Output Short-Circuit Current
RS-232 RECEIVERS
VCC = +5.5V, VSHDN = 0V, VOUT = ±15V,
MAX222/MAX242
VCC = VSHDN = 0V
VOUT = ±15V
MAX220, VOUT = ±12V
VCC = V+ = V- = 0V, VOUT = ±2V
VOUT = 0V
VOUT = 0V
MAX220
±0.01
±0.01
200
300 10M
±7 ±22
±10
±10
±25
116
±60
μA
kbps

mA
RS-232 Input Voltage Operating Range
MAX220
±30
V
±25
RS-232 Input Threshold Low
RS-232 Input Threshold High
VCC = +5V
VCC = +5V
All except MAX243 R2IN 0.8 1.3
MAX243 R2IN (Note 4)
-3
All except MAX243 R2IN
1.8 2.4
MAX243 R2IN (Note 4)
-0.5 -0.1
V
V
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MAX232 Datasheet PDF
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MAX220–MAX249
+5V-Powered, Multichannel
RS-232 Drivers/Receivers
Electrical Characteristics—MAX220/222/232A/233A/242/243 (continued)
(VCC = +5V ±10%, C1–C4 = 0.1µF‚ MAX220, C1 = 0.047µF, C2–C4 = 0.33µF, TA = TMIN to TMAX‚ unless otherwise noted.) (Note 3)
PARAMETER
CONDITIONS
MIN TYP MAX
RS-232 Input Hysteresis
All except MAX220/MAX243, VCC = +5V, no
hysteresis in shutdown
MAX220
MAX243
RS-232 Input Resistance
TA = +25°C (MAX220)
TTL/CMOS Output Voltage Low
TTL/CMOS Output Voltage High
TTL/CMOS Output Short-Circuit Current
TTL/CMOS Output Leakage Current
EN Input Threshold Low
EN Input Threshold High
Supply Voltage Range
VCC Supply Current (VSHDN = VCC),
Figures 5, 6, 11, 19
IOUT = 3.2mA
IOUT = 1.6mA (MAX220)
IOUT = -1.0mA
Sourcing VOUT = VGND
Sinking VOUT = VCC
VSHDN = VCC or VEN = VCC (VSHDN = 0V for
MAX222), 0V  VOUT  VCC
MAX242
MAX242
No load
3k load
both inputs
MAX220
MAX222/MAX232A/MAX233A/
MAX242/MAX243
MAX220
MAX222/MAX232A/MAX233A/
MAX242/MAX243
0.2 0.5
1.0
0.3
1
35
7
35
7
0.2 0.4
0.4
3.5 VCC - 0.2
-2 -10
10 30
±0.05 ±10
1.4
2.0 1.4
4.5
0.5
0.8
5.5
2
4 10
12
15
Shutdown Supply Current
SHDN Input Leakage Current
SHDN Threshold Low
SHDN Threshold High
TA = +25°C
MAX222/
MAX242
TA = 0°C to +70°C
TA = -40°C to +85°C
TA = -55°C to +125°C
MAX222/MAX242
MAX222/MAX242
MAX222/MAX242
0.1 10
2 50
2 50
35 100
±1
1.4 0.8
2.0 1.4
Transition Slew Rate
CL = 50pF to 2500pF, MAX222/MAX232A/
RL = 3k to 7k, MAX233/MAX242/MAX243
6
12
30
VCC = +5V, TA =
+25°C, measured
from +3V to -3V or MAX220
1.5 3 30.0
-3V to +3V
Transmitter Propagation Delay TLL to
RS-232 (Normal Operation)
tPHLT, Figure 1
tPLHT, Figure 1
MAX222/MAX232A/
MAX233/MAX242/MAX243
MAX220
MAX222/MAX232A/
MAX233/MAX242/MAX243
MAX220
1.3 3.5
4 10
1.5 3.5
5 10
UNITS
V
k
V
V
mA
μA
V
V
V
mA
μA
μA
V
V
V/μs
μs
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MAX220–MAX249
+5V-Powered, Multichannel
RS-232 Drivers/Receivers
Electrical Characteristics—MAX220/222/232A/233A/242/243 (continued)
(VCC = +5V ±10%, C1–C4 = 0.1µF‚ MAX220, C1 = 0.047µF, C2–C4 = 0.33µF, TA = TMIN to TMAX‚ unless otherwise noted.) (Note 3)
PARAMETER
CONDITIONS
MIN TYP
Receiver Propagation Delay RS-232 to
TLL (Normal Operation)
tPHLR, Figure 2
tPLHR, Figure 2
Receiver Propagation Delay RS-232 to
TLL (Shutdown)
Receiver-Output Enable Time
Receiver-Output Disable Time
Transmitter-Output Enable Time
(SHDN Goes High)
tPHLS, Figure 2
tPHLS, Figure 2
tER
tDR
tET
MAX222/MAX232A/MAX233/
MAX242/MAX243
MAX220
MAX222/MAX232A/MAX233/
MAX242/MAX243
MAX220
MAX242
MAX242
MAX242, Figure 3
MAX242, Figure 3
MAX222/MAX242, 0.1μF
caps (includes charge-pump
start-up), Figure 4
0.5
0.6
0.6
0.8
0.5
2.5
125
160
250
Transmitter-Output Disable Time
(SHDN Goes Low)
tDT
MAX222/MAX242,
0.1μF caps, Figure 4
600
Transmitter + to - Propagation Delay
Difference (Normal Operation)
tPHLT - tPLHT
MAX222/MAX232A/MAX233/
MAX242/MAX243
MAX220
300
2000
Receiver + to - Propagation Delay
Difference (Normal Operation)
tPHLR - tPLHR
MAX222/MAX232A/MAX233/
MAX242/MAX243
MAX220
100
225
Note 3: All units are production tested at hot. Specifications over temperature are guaranteed by design.
Note 4: MAX243 R2OUT is guaranteed to be low when R2IN 0V or is unconnected.
MAX
1
3
1
3
10
10
500
500
UNITS
μs
μs
ns
ns
μs
ns
ns
ns
Typical Operating Characteristics
MAX220/MAX222/MAX232A/MAX233A/MAX242/MAX243
OUTPUT VOLTAGE vs. LOAD CURRENT
10
1μF
8
6 EITHER V+ OR V- LOADED
4 VCC = +5V
NO LOAD ON
2 TRANSMITTER OUTPUTS
0 (EXCEPT MAX220, MAX233A)
0.1μF
-2 V- LOADED, NO LOAD ON V+
-4
0.1μF
1μF
-6
-8
-10
0
V+ LOADED, NO LOAD ON V-
5 10 15 20
LOAD CURRENT (mA)
25
AVAILABLE OUTPUT CURRENT
vs. DATA RATE
11
OUTPUT LOAD CURRENT
10 FLOWS FROM V+ TO V-
ALL CAPS
9 1μF
8 VCC = +5.25V
7
ALL CAPS
0.1μF
6
VCC = +4.75V
5
4
0
10 20 30 40 50 60
DATA RATE (kb/s)
MAX222/MAX242
ON-TIME EXITING SHUTDOWN
+10V
1μF CAPS
V+
+5V
0.1μF CAPS
+5V
SHDN
0V
V+
0V
1μF CAPS
V-
-10V
0.1μF CAPS
500μs/div
V-
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MAX220–MAX249
+5V-Powered, Multichannel
RS-232 Drivers/Receivers
Absolute Maximum Ratings—MAX223/MAX230–MAX241
(Voltages referenced to GND.)
VCC ...........................................................................-0.3V to +6V
V+ ................................................................(VCC - 0.3V) to +14V
V- ............................................................................+0.3V to -14V
Input Voltages
TIN ............................................................-0.3V to (VCC + 0.3V)
RIN .....................................................................................±30V
Output Voltages
TOUT ..................................................(V+ + 0.3V) to (V- - 0.3V)
ROUT........................................................-0.3V to (VCC + 0.3V)
Short-Circuit Duration, TOUT to GND ........................Continuous
Continuous Power Dissipation (TA = +70°C)
14-Pin Plastic DIP (derate 10.00mW/°C above +70°C)....800mW
16-Pin Plastic DIP (derate 10.53mW/°C above +70°C)....842mW
20-Pin Plastic DIP (derate 11.11mW/°C above +70°C)....889mW
24-Pin Narrow Plastic DIP
(derate 13.33mW/°C above +70°C) ..........1.07W
24-Pin Plastic DIP (derate 9.09mW/°C above +70°C)......500mW
16-Pin Wide SO (derate 9.52mW/°C above +70°C).........762mW
20-Pin Wide SO (derate 10.00mW/°C above +70°C).......800mW
24-Pin Wide SO (derate 11.76mW/°C above +70°C).......941mW
28-Pin Wide SO (derate 12.50mW/°C above +70°C) .............1W
44-Pin Plastic FP (derate 11.11mW/°C above +70°C) .....889mW
14-Pin CERDIP (derate 9.09mW/°C above +70°C) ..........727mW
16-Pin CERDIP (derate 10.00mW/°C above +70°C) ........800mW
20-Pin CERDIP (derate 11.11mW/°C above +70°C) ........889mW
24-Pin Narrow CERDIP
(derate 12.50mW/°C above +70°C) ..............1W
24-Pin Sidebraze (derate 20.0mW/°C above +70°C)..........1.6W
28-Pin SSOP (derate 9.52mW/°C above +70°C).............762mW
Operating Temperature Ranges
MAX2 _ _ C _ _......................................................0°C to +70°C
MAX2 _ _ E _ _ ...................................................-40°C to +85°C
MAX2 _ _ M _ _......................................................-55°C to +125°C
Storage Temperature Range .............................-65°C to +160°C
Lead Temperature (soldering, 10s) .................................+300°C
Soldering Temperature (reflow)
20 PDIP (P20M+1) .........................................................+225°C
24 PDIP (P24M-1) ..........................................................+225°C
All other lead(Pb)-free packages...................................+260°C
All other packages containing lead(Pb) ...........................+240°C
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
Electrical Characteristics—MAX223/MAX230–MAX241
(MAX223/230/232/234/236/237/238/240/241, VCC = +5V ±10%; MAX233/MAX235, VCC = +5V ±5%‚ C1–C4 = 1.0µF;
MAX231/MAX239, VCC = +5V ±10%; V+ = +7.5V to +13.2V; TA = TMIN to TMAX; unless otherwise noted.) (Note 5)
PARAMETER
CONDITIONS
MIN TYP MAX UNITS
Output Voltage Swing
All transmitter outputs loaded with 3kΩ to ground
±5.0
±7.3
V
VCC Supply Current
No load,
TA = +25°C
MAX232/233
MAX223/230/234–238/240/241
MAX231/239
5 10
7 15
0.4 1
mA
V+ Supply Current
MAX231
MAX239
1.8 5
5 15
mA
Shutdown Supply Current
Input Logic-Low Voltage
MAX223
TA = +25°C MAX230/235/236/240/241
TIN, EN, SHDN (MAX233); EN, SHDN (MAX230/235–241)
15 50
1 10
0.8
µA
V
TIN 2.0
Input Logic-High Voltage
EN, SHDN (MAX223);
EN, SHDN (MAX230/235/236/240/241)
2.4
V
Logic Pullup Current
VTIN = 0V
1.5 200
µA
Receiver Input Voltage
Operating Range
-30 +30 V
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MAX220–MAX249
+5V-Powered, Multichannel
RS-232 Drivers/Receivers
Electrical Characteristics—MAX223/MAX230–MAX241 (continued)
(MAX223/230/232/234/236/237/238/240/241, VCC = +5V ±10%; MAX233/MAX235, VCC = +5V ±5%‚ C1–C4 = 1.0µF;
MAX231/MAX239, VCC = +5V ±10%; V+ = +7.5V to +13.2V; TA = TMIN to TMAX; unless otherwise noted.) (Note 5)
PARAMETER
CONDITIONS
MIN TYP MAX UNITS
RS-232 Input Logic-Low Voltage
TA = +25°C,
VCC = +5V
Normal operation
VSHDN = +5V (MAX223)
VSHDN = 0V (MAX235/236/240/241)
Shutdown (MAX223)
VSHDN = 0V,
VEN = +5V (R4IN, R5IN)
0.8
0.6
1.2
1.5
V
RS-232 Input Logic-High Voltage
TA = +25°C,
VCC = +5V
Normal operation
VSHDN = 5V (MAX223)
VSHDN = 0V (MAX235/236/240/241)
Shutdown (MAX223)
VSHDN = 0V,
VEN = +5V (R4IN‚ R5IN)
1.7 2.4
V
1.5 2.4
RS-232 Input Hysteresis
VCC = +5V, no hysteresis in shutdown
RS-232 Input Resistance
TA = +25°C, VCC = +5V
TTL/CMOS Output Voltage Low
IOUT = 1.6mA (MAX231/232/233, IOUT = 3.2mA)
TTL/CMOS Output Voltage High
IOUT = -1mA
TTL/CMOS Output Leakage Current
0V ROUT VCC; VEN = 0V (MAX223);
VEN = VCC (MAX235–241)
0.2 0.5 1.0
357
0.4
3.5 VCC - 0.4
±0.05 ±10
V
kΩ
V
V
µA
Receiver Output Enable Time
Normal
operation
MAX223
MAX235/236/239/240/241
600
ns
400
Receiver Output Disable Time
Normal
operation
MAX223
MAX235/236/239/240/241
900
ns
250
Propagation Delay
Transition Region Slew Rate
RS-232 IN to
Normal operation
TTL/CMOS OUT, VSHDN = 0V
CL = 150pF
(MAX223)
tPHLS
tPLHS
0.5 10
4 40 µs
6 40
MAX223/MAX230/MAX234–241, TA = +25°C, VCC = +5V,
RL = 3kΩ to 7kΩ‚ CL = 50pF to 2500pF, measured from
3
5.1
30
+3V to -3V or -3V to +3V
V/µs
MAX231/MAX232/MAX233, TA = +25°C, VCC = +5V,
RL = 3kΩ to 7kΩ, CL = 50pF to 2500pF, measured from
4 30
+3V to -3V or -3V to +3V
Transmitter Output Resistance
VCC = V+ = V- = 0V, VOUT = ±2V
300 Ω
Transmitter Output Short-Circuit
Current
±10 mA
mA
Note 5: All units are production tested at hot except for the MAX240, which is production tested at TA = +25°C. Specifications over
temperature are guaranteed by design.
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MAX220–MAX249
+5V-Powered, Multichannel
RS-232 Drivers/Receivers
Typical Operating Characteristics
MAX223/MAX230–MAX241
TRANSMITTER OUTPUT
VOLTAGE (VOH) vs. VCC
8.5
2 TRANSMITTERS
LOADED
8.0
1 TRANSMITTER
LOADED
7.5
3 TRANS-
MITTERS
LOADED
7.0
6.5
4.5
TA = +25°C
C1–C4 = 1μF
TRANSMITTER
4 TRANSMITTERS LOADS =
LOADED
3kΩ || 2500pF
5.0 5.5
VCC (V)
TRANSMITTER OUTPUT
VOLTAGE (VOL) vs. VCC
-6.0
4 TRANS- TA = +25°C
MITTERS C1–C4 = 1μF
-6.5 LOADED TRANSMITTER
LOADS =
-7.0 3kΩ || 2500pF
-7.5
1 TRANS-
-8.0 MITTER
LOADED
-8.5 2 TRANS-
MITTERS
LOADED
-9.0
4.5
3 TRANS-
MITTERS
LOADED
5.0
VCC (V)
5.5
TRANSMITTER OUTPUT VOLTAGE (VOH)
vs. LOAD CAPACITANCE AT
DIFFERENT DATA RATES
7.4
7.2
7.0
6.8 160kb/s
80kb/s
6.6 20kb/s
6.4 TA = +25°C
VCC = +5V
6.2
3 TRANSMITTERS LOADED
RL = 3kΩ
C1–C4 = 1μF
6.0
0 500 1000 1500
2000
LOAD CAPACITANCE (pF)
2500
TRANSMITTER OUTPUT VOLTAGE (VOL)
vs. LOAD CAPACITANCE AT
DIFFERENT DATA RATES
-6.0
TA = +25°C
-6.2 VCC = +5V
3 TRANSMITTERS LOADED
-6.4 RL = 3kΩ
C1–C4 = 1μF
-6.6
-6.8
160kb/s
80kb/s
-7.0 20kb/s
-7.2
-7.4
-7.6
0
500 1000 1500 2000
LOAD CAPACITANCE (pF)
2500
V+, V- WHEN EXITING SHUTDOWN
(1μF CAPACITORS)
MAX220-13
TRANSMITTER SLEW RATE
vs. LOAD CAPACITANCE
12.0
1 TRANSMITTER LOADED TA = +25°C
11.0 VCC = +5V
LOADED, RL = 3kΩ
10.0 C1–C4 = 1μF
9.0 2 TRANSMITTERS
LOADED
8.0
7.0
6.0
5.0
4.0
0
3 TRANSMITTERS
LOADED
4 TRANSMITTERS
LOADED
500 1000 1500 2000
LOAD CAPACITANCE (pF)
2500
TRANSMITTER OUTPUT VOLTAGE (V+, V-)
vs. LOAD CURRENT
10
8
6 TA = +25°C
4 VCC = +5V
C1–C4 = 1μF
2
0
-2
V+ AND V-
EQUALLY
LOADED
V- LOADED,
NO LOAD
ON V+
V+ LOADED,
NO LOAD
ON V-
-4
-6
-8
-10 ALL TRANSMITTERS UNLOADED
0 5 10 15 20 25 30 35 40 45 50
CURRENT (mA)
V+
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500ms/div
*SHUTDOWN POLARITY IS REVERSED
FOR NON MAX241 PARTS
O
V-
VSHDN*
Maxim Integrated | 7


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MAX220–MAX249
+5V-Powered, Multichannel
RS-232 Drivers/Receivers
Absolute Maximum Ratings—MAX225/MAX244–MAX249
(Voltages referenced to GND.)
Supply Voltage (VCC) ...............................................-0.3V to +6V
Input Voltages
TIN‚ ENA, ENB, ENR, ENT, ENRA,
ENRB, ENTA, ENTB..................................-0.3V to (VCC + 0.3V)
RIN .....................................................................................±25V
Continuous Power Dissipation (TA = +70°C)
28-Pin Wide SO (derate 12.50mW/°C above +70°C) .............1W
40-Pin Plastic DIP (derate 11.11mW/°C above +70°C) ...611mW
44-Pin PLCC (derate 13.33mW/°C above +70°C) ...........1.07W
Operating Temperature Ranges
MAX225C_ _, MAX24_C_ _ ..................................0°C to +70°C
TOUT (Note 6)....................................................................±15V
ROUT........................................................-0.3V to (VCC + 0.3V)
Short Circuit Duration (one output at a time)
MAX225E_ _, MAX24_E_ _ ...............................-40°C to +85°C
Storage Temperature Range .............................-65°C to +160°C
Lead Temperature (soldering,10s)) .................................+300°C
TOUT to GND ...........................................................Continuous
ROUT to GND...........................................................Continuous
Soldering Temperature (reflow)
40 PDIP (P40M-2) ..........................................................+225°C
All other lead(Pb)-free packages...................................+260°C
All other packages containing lead(Pb) ........................+240°C
Note 6: Input voltage measured with transmitter output in a high-impedance state, shutdown, or VCC = 0V.
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
Electrical Characteristics—MAX225/MAX244–MAX249
(MAX225, VCC = +5.0V ±5%; MAX244–MAX249, VCC = +5.0V ±10%, external capacitors C1–C4 = 1µF; TA = TMIN to TMAX; unless
otherwise noted.) (Note 7)
PARAMETER
CONDITIONS
MIN TYP MAX UNITS
RS-232 TRANSMITTERS
Input Logic-Low Voltage
1.4 0.8
V
Input Logic-High Voltage
2 1.4
V
Logic Pullup/lnput Current
Normal operation
Tables 1a–1d
Shutdown
10
±0.01
50
±1
µA
Data Rate
Tables 1a–1d, normal operation
120 64 kbps
Output Voltage Swing
All transmitter outputs loaded with 3kΩ to GND
±5 ±7.5
V
Output Leakage Current (Shutdown)
Tables 1a–1d
VENA, VENB, VENT, VENTA,
VENTB = VCC, VOUT = ±15V
VCC = 0V,
VOUT = ±15V
±0.01 ±25
±0.01 ±25
µA
Transmitter Output Resistance
Output Short-Circuit Current
RS-232 RECEIVERS
VCC = V+ = V- = 0V, VOUT = ±2V (Note 8)
VOUT = 0V
300 10M
±7 ±30
Ω
mA
RS-232 Input Voltage Operating Range
±25 V
RS-232 Input Logic-Low Voltage
RS-232 Input Logic-High Voltage
RS-232 Input Hysteresis
RS-232 Input Resistance
VCC = +5V
VCC = +5V
VCC = +5V
0.8 1.3
V
1.8 2.4
V
0.2 0.5 1.0
V
3 5 7 kΩ
TTL/CMOS Output Voltage Low
TTL/CMOS Output Voltage High
TTL/CMOS Output Short-Circuit Current
IOUT = 3.2mA
IOUT = -1.0mA
Sourcing VOUT = VGND
Sinking VOUT = VCC
0.2 0.4
3.5 VCC - 0.2
-2 -10
10 30
V
V
mA
TTL/CMOS Output Leakage Current
Normal operation, outputs disabled,
Tables 1a–1d, 0V VOUT VCC, VENR_ = VCC
±0.05 ±0.10 µA
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MAX220–MAX249
+5V-Powered, Multichannel
RS-232 Drivers/Receivers
Electrical Characteristics—MAX225/MAX244–MAX249 (continued)
(MAX225, VCC = +5.0V ±5%; MAX244–MAX249, VCC = +5.0V ±10%, external capacitors C1–C4 = 1µF; TA = TMIN to TMAX; unless
otherwise noted.) (Note 7)
PARAMETER
CONDITIONS
MIN TYP MAX UNITS
POWER SUPPLY AND CONTROL LOGIC
Supply Voltage Range
MAX225
MAX244–MAX249
4.75 5.25
V
4.5 5.5
VCC Supply Current
(Normal Operation)
No load
3kΩ loads on
all outputs
MAX225
MAX244–MAX249
MAX225
MAX244–MAX249
10 20
11 30
mA
40
57
Shutdown Supply Current
TA = +25°C
TA = TMIN to TMAX
Leakage current
8 25
µA
50
±1 µA
Control Input
Logic-low voltage
Logic-high voltage
1.4 0.8
V
2.4 1.4
AC CHARACTERISTICS
Transition Slew Rate
CL = 50pF to 2500pF, RL = 3kΩ to 7kΩ, VCC = +5V,
TA = +25°C, measured from +3V to -3V or -3V to +3V
5
10 30 V/µs
Transmitter Propagation Delay
TLL to RS-232 (Normal Operation)
tPHLT, Figure 1
tPLHT, Figure 1
1.3 3.5
µs
1.5 3.5
Receiver Propagation Delay
TLL to RS-232 (Normal Operation)
tPHLR, Figure 2
tPLHR, Figure 2
0.6 1.5
µs
0.6 1.5
Receiver Propagation Delay
TLL to RS-232 (Low-Power Mode)
tPHLS, Figure 2
tPLHS, Figure 2
0.6 10
µs
3.0 10
Transmitter + to - Propagation
Delay Difference (Normal Operation)
tPHLT - tPLHT
350 ns
Receiver + to - Propagation
Delay Difference (Normal Operation)
tPHLR - tPLHR
350 ns
Receiver-Output Enable Time
Receiver-Output Disable Time
tER, Figure 3
tDR, Figure 3
100 500 ns
100 500 ns
Transmitter Enable Time
MAX246–MAX249
(excludes charge-pump startup)
tET
MAX225/MAX245–MAX249
(includes charge-pump startup)
5 µs
10 ms
Transmitter Disable Time
tDT, Figure 4
100 ns
Note 7: All units production tested at hot. Specifications over temperature are guaranteed by design.
Note 8: The 300Ω minimum specification complies with EIA/TIA-232E, but the actual resistance when in shutdown mode or VCC =
0V is 10MΩ as is implied by the leakage specification.
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MAX220–MAX249
+5V-Powered, Multichannel
RS-232 Drivers/Receivers
Typical Operating Characteristics
MAX225/MAX244–MAX249
18
16
14
12
10
8
6
4
2
0
TRANSMITTER SLEW RATE
vs. LOAD CAPACITANCE
VCC = +5V
EXTERNAL POWER SUPPLY
1μF CAPACITORS
40kb/s DATA RATE
8 TRANSMITTERS
LOADED WITH 3kΩ
12 3 4
LOAD CAPACITANCE (nF)
5
OUTPUT VOLTAGE
vs. LOAD CURRENT FOR V+ AND V-
10
8
V+ AND V- LOADED
6
4 VCC = +5V
2 EXTERNAL CHARGE PUMP
1μF CAPACITORS
0 8 TRANSMITTERS
-2
DRIVING 5kΩ AND
2000pF AT 20kb/s
-4
EITHER V+ OR
V- LOADED
V- LOADED
-6 V+ AND V- LOADED
-8
-10
0
V+ LOADED
5 10 15 20 25 30 35
LOAD CURRENT (mA)
TRANSMITTER OUTPUT VOLTAGE (V+, V-)
vs. LOAD CAPACITANCE AT
DIFFERENT DATA RATES
9.0
VCC = +5V WITH ALL TRANSMITTERS DRIVEN
8.5 LOADED WITH 5kΩ
10kb/s
8.0 20kb/s
7.5 40kb/s
7.0 60kb/s
6.5
6.0 100kb/s
200kb/s
5.5
ALL CAPACITIORS 1μF
5.0
012
3
4
LOAD CAPACITANCE (nF)
5
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MAX220–MAX249
+5V-Powered, Multichannel
RS-232 Drivers/Receivers
Test Circuits/Timing Diagrams
+3V
INPUT
OUTPUT
tPLHT
0V
V+
0V
V-
tPHLT
Figure 1. Transmitter Propagation-Delay Timing
0V*
INPUT
+3V
50%
50%
OUTPUT
tPHLR
tPHLS
50%
VCC
50%
GND
tPLHR
tPLHS
*EXCEPT FOR R2 ON THE MAX243
WHERE -3V IS USED.
Figure 2. Receiver Propagation-Delay Timing
EN
RX IN
a) TEST CIRCUIT
EN INPUT
RECEIVER
OUTPUTS
RX OUT 1kΩ
RX
VCC - 2V
150pF
+3V
0V EN
OUTPUT ENABLE TIME (tER)
+3.5V
+0.8V
b) ENABLE TIMING
0V
EN INPUT
VOH
RECEIVER
OUTPUTS
VOL
c) DISABLE TIMING
+3V EN
OUTPUT DISABLE TIME (tDR)
VOH - 0.5V
VCC - 2V
VOL + 0.5V
Figure 3. Receiver-Output Enable and Disable Timing
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SHDN
+3V
V+
V-
0V
OUTPUT DISABLE TIME (tDT)
+5V
0V
-5V
a) TIMING DIAGRAM
1 OR 0
TX
3kΩ 50pF
b) TEST CIRCUIT
Figure 4. Transmitter-Output Disable Timing
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MAX220–MAX249
+5V-Powered, Multichannel
RS-232 Drivers/Receivers
Control Pin Configuration Tables
Table 1a. MAX245 Control Pin Configurations
ENT
ENR
OPERATION STATUS
TRANSMITTERS
0 0 Normal Operation
All Active
0 1 Normal Operation
All Active
1 0 Shutdown
All High-Z
1 1 Shutdown
All High-Z
RECEIVERS
All Active
All High-Z
All Low-Power Receive Mode
All High-Z
Table 1b. MAX245 Control Pin Configurations
ENT
ENR
OPERATION
STATUS
TRANSMITTERS
TA1–TA4
TB1–TB4
0
0 Normal Operation
All Active
All Active
0
1 Normal Operation
All Active
All Active
1 0 Shutdown
All High-Z
All High-Z
1 1 Shutdown
All High-Z
All High-Z
RECEIVERS
RA1–RA5
RB1–RB5
All Active
All Active
RA1–RA4 High-Z, RB1–RB4 High-Z,
RA5 Active
RB5 Active
All Low-Power
Receive Mode
All Low-Power
Receive Mode
RA1–RA4 High-Z,
RA5 Low-Power
Receive Mode
RB1–RB4 High-Z,
RB5 Low-Power
Receive Mode
Table 1c. MAX246 Control Pin Configurations
ENA
ENB
OPERATION
STATUS
TRANSMITTERS
TA1–TA4
TB1–TB4
0
0 Normal Operation
All Active
All Active
0
1 Normal Operation
All Active
All High-Z
1 0 Shutdown
All High-Z
All Active
1 1 Shutdown
All High-Z
All High-Z
RECEIVERS
RA1–RA5
RB1–RB5
All Active
All Active
All Active
RB1–RB4 High-Z,
RB5 Active
RA1–RA4 High-Z,
RA5 Active
All Active
RA1–RA4 High-Z,
RA5 Low-Power
Receive Mode
RB1–RB4 High-Z,
RA5 Low-Power
Receive Mode
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MAX220–MAX249
+5V-Powered, Multichannel
RS-232 Drivers/Receivers
Table 1d. MAX247/MAX248/MAX249 Control Pin Configurations
TRANSMITTERS
RECEIVERS
ENTA ENTB ENRA ENRB
OPERATION
STATUS
MAX247 TA1–TA4 TB1–TB4
MAX248 TA1–TA4 TB1–TB4
RA1–RA4
RA1–RA4
RB1–RB5
RB1–RB4
MAX249 TA1–TA3 TB1–TB3
RA1–RA5
RB1–RB5
0 0 0 0 Normal Operation
All Active All Active All Active
All Active
0 0 0 1 Normal Operation
All Active All Active All Active
All High-Z, except
RB5 stays active on
MAX247
0 0 1 0 Normal Operation
All Active All Active All High-Z
All Active
0 0 1 1 Normal Operation
All Active All Active All High-Z
All High-Z, except
RB5 stays active on
MAX247
0 1 0 0 Normal Operation
All Active All High-Z All Active
All Active
0 1 0 1 Normal Operation
All Active All High-Z All Active
All High-Z, except
RB5 stays active on
MAX247
0 1 1 0 Normal Operation
All Active All High-Z All High-Z
All Active
0 1 1 1 Normal Operation
All Active All High-Z All High-Z
All High-Z, except
RB5 stays active on
MAX247
1 0 0 0 Normal Operation
All High-Z All Active All Active
All Active
1 0 0 1 Normal Operation
All High-Z All Active All Active
All High-Z, except
RB5 stays active on
MAX247
1 0 1 0 Normal Operation
All High-Z All Active All High-Z
All Active
1 0 1 1 Normal Operation
All High-Z All Active All High-Z
All High-Z, except
RB5 stays active on
MAX247
1100
Shutdown
All High-Z
All High-Z
Low-Power
Receive Mode
Low-Power
Receive Mode
1101
Shutdown
All High-Z
All High-Z
Low-Power
Receive Mode
All High-Z, except
RB5 stays active on
MAX247
1110
Shutdown
All High-Z All High-Z All High-Z
Low-Power
Receive Mode
1111
Shutdown
All High-Z All High-Z All High-Z
All High-Z, except
RB5 stays active on
MAX247
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MAX220–MAX249
+5V-Powered, Multichannel
RS-232 Drivers/Receivers
Detailed Description
The MAX220–MAX249 contain four sections: dual
charge-pump DC-DC voltage converters, RS-232 dri-
vers, RS-232 receivers, and receiver and transmitter
enable control inputs.
Dual Charge-Pump Voltage Converter
The MAX220–MAX249 have two internal charge-pumps
that convert +5V to ±10V (unloaded) for RS-232 driver
operation. The first converter uses capacitor C1 to dou-
ble the +5V input to +10V on C3 at the V+ output. The
second converter uses capacitor C2 to invert +10V to
-10V on C4 at the V- output.
A small amount of power may be drawn from the +10V
(V+) and -10V (V-) outputs to power external circuitry
(see the Typical Operating Characteristics section),
except on the MAX225 and MAX245–MAX247, where
these pins are not available. V+ and V- are not regulated,
so the output voltage drops with increasing load current.
Do not load V+ and V- to a point that violates the mini-
mum ±5V EIA/TIA-232E driver output voltage when
sourcing current from V+ and V- to external circuitry.
When using the shutdown feature in the MAX222,
MAX225, MAX230, MAX235, MAX236, MAX240,
MAX241, and MAX245–MAX249, avoid using V+ and V-
to power external circuitry. When these parts are shut
down, V- falls to 0V, and V+ falls to +5V. For applica-
tions where a +10V external supply is applied to the V+
pin (instead of using the internal charge pump to gen-
erate +10V), the C1 capacitor must not be installed and
the SHDN pin must be connected to VCC. This is
because V+ is internally connected to VCC in shutdown
mode.
RS-232 Drivers
The typical driver output voltage swing is ±8V when
loaded with a nominal 5kΩ RS-232 receiver and VCC =
+5V. Output swing is guaranteed to meet the EIA/TIA-
232E and V.28 specification, which calls for ±5V mini-
mum driver output levels under worst-case conditions.
These include a minimum 3kΩ load, VCC = +4.5V, and
maximum operating temperature. Unloaded driver out-
put voltage ranges from (V+ -1.3V) to (V- +0.5V).
Input thresholds are both TTL and CMOS compatible.
The inputs of unused drivers can be left unconnected
since 400kΩ input pullup resistors to VCC are built in
(except for the MAX220). The pullup resistors force the
outputs of unused drivers low because all drivers invert.
The internal input pullup resistors typically source 12µA,
except in shutdown mode where the pullups are dis-
abled. Driver outputs turn off and enter a high-imped-
ance state—where leakage current is typically
microamperes (maximum 25µA)—when in shutdown
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mode, in three-state mode, or when device power is
removed. Outputs can be driven to ±15V. The power-
supply current typically drops to 8µA in shutdown mode.
The MAX220 does not have pullup resistors to force the
outputs of the unused drivers low. Connect unused
inputs to GND or VCC.
The MAX239 has a receiver three-state control line, and
the MAX223, MAX225, MAX235, MAX236, MAX240,
and MAX241 have both a receiver three-state control
line and a low-power shutdown control. Table 2 shows
the effects of the shutdown control and receiver three-
state control on the receiver outputs.
The receiver TTL/CMOS outputs are in a high-imped-
ance, three-state mode whenever the three-state enable
line is high (for the MAX225/MAX235/MAX236/MAX239–
MAX241), and are also high-impedance whenever the
shutdown control line is high.
When in low-power shutdown mode, the driver outputs
are turned off and their leakage current is less than 1µA
with the driver output pulled to ground. The driver output
leakage remains less than 1µA, even if the transmitter
output is backdriven between 0V and (VCC + 6V). Below
-0.5V, the transmitter is diode clamped to ground with
1kΩ series impedance. The transmitter is also zener
clamped to approximately VCC + 6V, with a series
impedance of 1kΩ.
The driver output slew rate is limited to less than 30V/µs
as required by the EIA/TIA-232E and V.28 specifica-
tions. Typical slew rates are 24V/µs unloaded and
10V/µs loaded with 3Ω and 2500pF.
RS-232 Receivers
EIA/TIA-232E and V.28 specifications define a voltage
level greater than 3V as a logic 0, so all receivers invert.
Input thresholds are set at 0.8V and 2.4V, so receivers
respond to TTL level inputs as well as EIA/TIA-232E and
V.28 levels.
Table 2. Three-State Control of
Receivers
PART SHDN SHDN EN EN(R) RECEIVERS
MAX223
Low X
__ High Low
High High
High Impedance
__ Active
High Impedance
MAX225 __
__
__
Low
High
High Impedance
Active
MAX235 Low
MAX236 Low
MAX240 High
__
Low High Impedance
__ High Active
X High Impedance
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MAX220–MAX249
+5V-Powered, Multichannel
RS-232 Drivers/Receivers
The receiver inputs withstand an input overvoltage up
to ±25V and provide input terminating resistors with
nominal 5kΩ values. The receivers implement Type 1
interpretation of the fault conditions of V.28 and
EIA/TIA-232E.
The receiver input hysteresis is typically 0.5V with a
guaranteed minimum of 0.2V. This produces clear out-
put transitions with slow-moving input signals, even
with moderate amounts of noise and ringing. The
receiver propagation delay is typically 600ns and is
independent of input swing direction.
Low-Power Receive Mode
The low-power receive mode feature of the MAX223,
MAX242, and MAX245–MAX249 puts the IC into shut-
down mode but still allows it to receive information. This
is important for applications where systems are periodi-
cally awakened to look for activity. Using low-power
receive mode, the system can still receive a signal that
will activate it on command and prepare it for communi-
cation at faster data rates. This operation conserves
system power.
Negative Threshold—MAX243
The MAX243 is pin compatible with the MAX232A, differ-
ing only in that RS-232 cable fault protection is removed
on one of the two receiver inputs. This means that control
lines such as CTS and RTS can either be driven or left
unconnected without interrupting communication.
Different cables are not needed to interface with different
pieces of equipment.
The input threshold of the receiver without cable fault
protection is -0.8V rather than +1.4V. Its output goes
positive only if the input is connected to a control line
that is actively driven negative. If not driven, it defaults
to the 0 or “OK to send” state. Normally‚ the MAX243’s
other receiver (+1.4V threshold) is used for the data line
(TD or RD)‚ while the negative threshold receiver is con-
nected to the control line (DTR‚ DTS‚ CTS‚ RTS, etc.).
Other members of the RS-232 family implement the
optional cable fault protection as specified by EIA/TIA-
232E specifications. This means a receiver output goes
high whenever its input is driven negative‚ left uncon-
nected‚ or shorted to ground. The high output tells the
serial communications IC to stop sending data. To
avoid this‚ the control lines must either be driven or
connected with jumpers to an appropriate positive volt-
age level.
Shutdown—MAX222–MAX242
On the MAX222‚ MAX235‚ MAX236‚ MAX240‚ and
MAX241‚ all receivers are disabled during shutdown.
On the MAX223 and MAX242‚ two receivers continue to
operate in a reduced power mode when the chip is in
shutdown. Under these conditions‚ the propagation
delay increases to about 2.5µs for a high-to-low input
transition. When in shutdown, the receiver acts as a
CMOS inverter with no hysteresis. The MAX223 and
MAX242 also have a receiver output enable input (EN
for the MAX242 and EN for the MAX223) that allows
receiver output control independent of SHDN (SHDN
for MAX241). With all other devices‚ SHDN (SHDN for
MAX241) also disables the receiver outputs.
The MAX225 provides five transmitters and five
receivers‚ while the MAX245 provides ten receivers and
eight transmitters. Both devices have separate receiver
and transmitter-enable controls. The charge pumps
turn off and the devices shut down when a logic high is
applied to the ENT input. In this state, the supply cur-
rent drops to less than 25µA and the receivers continue
to operate in a low-power receive mode. Driver outputs
enter a high-impedance state (three-state mode). On
the MAX225‚ all five receivers are controlled by the
ENR input. On the MAX245‚ eight of the receiver out-
puts are controlled by the ENR input‚ while the remain-
ing two receivers (RA5 and RB5) are always active.
RA1–RA4 and RB1–RB4 are put in a three-state mode
when ENR is a logic high.
Receiver and Transmitter Enable
Control Inputs
The MAX225 and MAX245–MAX249 feature transmitter
and receiver enable controls.
The receivers have three modes of operation: full-speed
receive (normal active)‚ three-state (disabled)‚ and low-
power receive (enabled receivers continue to function
at lower data rates). The receiver enable inputs control
the full-speed receive and three-state modes. The
transmitters have two modes of operation: full-speed
transmit (normal active) and three-state (disabled). The
transmitter enable inputs also control the shutdown
mode. The device enters shutdown mode when all
transmitters are disabled. Enabled receivers function in
the low-power receive mode when in shutdown.
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MAX220–MAX249
+5V-Powered, Multichannel
RS-232 Drivers/Receivers
Tables 1a–1d define the control states. The MAX244
has no control pins and is not included in these tables.
The MAX246 has ten receivers and eight drivers with
two control pins, each controlling one side of the
device. A logic high at the A-side control input (ENA)
causes the four A-side receivers and drivers to go into
a three-state mode. Similarly, the B-side control input
(ENB) causes the four B-side drivers and receivers to
go into a three-state mode. As in the MAX245, one A-
side and one B-side receiver (RA5 and RB5) remain
active at all times. The entire device is put into shut-
down mode when both the A and B sides are disabled
(ENA = ENB = +5V).
The MAX247 provides nine receivers and eight drivers
with four control pins. The ENRA and ENRB receiver
enable inputs each control four receiver outputs. The
ENTA and ENTB transmitter enable inputs each control
four drivers. The ninth receiver (RB5) is always active.
The device enters shutdown mode with a logic high on
both ENTA and ENTB.
The MAX248 provides eight receivers and eight drivers
with four control pins. The ENRA and ENRB receiver
enable inputs each control four receiver outputs. The
ENTA and ENTB transmitter enable inputs control four
drivers each. This part does not have an always-active
receiver. The device enters shutdown mode and trans-
mitters go into a three-state mode with a logic high on
both ENTA and ENTB.
The MAX249 provides ten receivers and six drivers with
four control pins. The ENRA and ENRB receiver enable
inputs each control five receiver outputs. The ENTA
and ENTB transmitter enable inputs control three dri-
vers each. There is no always-active receiver. The
device enters shutdown mode and transmitters go into
a three-state mode with a logic high on both ENTA and
ENTB. In shutdown mode, active receivers operate in a
low-power receive mode at data rates up to 20kb/s.
Applications Information
Figures 5 through 25 show pin configurations and typi-
cal operating circuits. In applications that are sensitive
to power-supply noise, VCC should be decoupled to
ground with a capacitor of the same value as C1 and
C2 connected as close as possible to the device.
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MAX220–MAX249
+5V-Powered, Multichannel
RS-232 Drivers/Receivers
TOP VIEW
+
C1+ 1
V+ 2
C1- 3
C2+ 4
C2- 5
V- 6
MAX220
MAX232
MAX232A
T2OUT 7
R2IN 8
16 VCC
15 GND
14 T1OUT
13 R1IN
12 R1OUT
11 T1IN
10 T2IN
9 R2OUT
DIP/SO
CAPACITANCE (μF)
DEVICE C1 C2 C3 C4 C5
MAX220 0.047 0.33 0.33 0.33 0.33
MAX232 1.0 1.0 1.0 1.0 1.0
MAX232A 0.1 0.1 0.1 0.1 0.1
+5V INPUT C3
C1
C2
TTL/CMOS
INPUTS
C5
16
1 C1+
3 C1-
4 C2+
5 C2-
VCC
+5V TO +10V
VOLTAGE DOUBLER
+10V TO -10V
VOLTAGE INVERTER
V+ 2 +10V
V- 6 -10V
C4
+5V
400kΩ
11 T1IN
T1OUT 14
+5V
400kΩ
10 T2IN
T2OUT 7
RS-232
OUTPUTS
TTL/CMOS
OUTPUTS
12 R1OUT
9 R2OUT
R1IN 13
5kΩ
R2IN 8
5kΩ
GND
15
RS-232
INPUTS
Figure 5. MAX220/MAX232/MAX232A Pin Configuration and Typical Operating Circuit
TOP VIEW
+
(N.C.) EN 1
C1+ 2
V+ 3
C1- 4
C2+ 5
C2- 6
MAX222
MAX242
V- 7
T2OUT 8
R2IN 9
+
(N.C.) EN 1
18 SHDN
17 VCC
16 GND
15 T1OUT
14 R1IN
C1+ 2
V+ 3
C1- 4
C2+ 5
C2- 6
MAX222
MAX242
13 R1OUT
V- 7
12 T1IN T2OUT 8
11 T2IN
R2IN 9
10 R2OUT R2OUT 10
20 SHDN
19 VCC
18 GND
17 T1OUT
16 N.C.
15 R1IN
14 R1OUT
13 N.C.
12 T1IN
11 T2IN
DIP/SO
SSOP
( ) ARE FOR MAX222 ONLY.
PIN NUMBERS IN TYPICAL OPERATING CIRCUIT ARE FOR DIP/SO PACKAGES ONLY.
C1
C2
TTL/CMOS
INPUTS
TTL/CMOS
OUTPUTS
+5V INPUT C3 ALL CAPACITORS = 0.1μF
C5
17
2
4
C1+
C1-
VCC
+5V TO +10V
VOLTAGE DOUBLER
V+
3
+10V
5
6
C2+ +10V TO -10V
C2- VOLTAGE INVERTER
V- 7
-10V
C4
+5V
400kΩ
12 T1IN
+5V
400kΩ
11 T2IN
(EXCEPT MAX220)
T1OUT 15
(EXCEPT MAX220)
T2OUT 8
RS-232
OUTPUTS
13 R1OUT
R1IN 14
10 R2OUT
5kΩ
R2IN 9
1 (N.C.) EN
GND
16
5kΩ
SHDN 18
RS-232
INPUTS
Figure 6. MAX222/MAX242 Pin Configurations and Typical Operating Circuit
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Maxim Integrated | 17


MAX232 Datasheet PDF
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MAX220–MAX249
+5V-Powered, Multichannel
RS-232 Drivers/Receivers
TOP VIEW
+
ENR 1
ENR 2
T1IN 3
T2IN 4
R1OUT 5
MAX225
R2OUT 6
R3OUT 7
R3IN 8
R2IN 9
R1IN 10
T1OUT 11
T2OUT 12
GND 13
GND 14
SO
28 VCC
27 VCC
26 ENT
25 T3IN
24 T4IN
23 T5IN
22 R4OUT
21 R5OUT
20 R5IN
19 R4IN
18 T3OUT
17 T4OUT
16 T5OUT
15 T5OUT
MAX225 FUNCTIONAL DESCRIPTION
5 RECEIVERS
5 TRANSMITTERS
2 CONTROL PINS
1 RECEIVER ENABLE (ENR)
1 TRANSMITTER ENABLE (ENT)
PINS (ENR, GND, VCC, T5OUT) ARE INTERNALLY CONNECTED.
CONNECT EITHER OR BOTH EXTERNALLY. T5OUT IS A SINGLE DRIVER.
+5V
0.1μF
28 27
+5V VCC VCC
400kΩ
T1IN
3
+5V
T1OUT
400kΩ
T2IN
4
+5V
T2OUT
400kΩ
T3IN
25
+5V
400kΩ
24 T4IN
+5V
T3OUT
T4OUT
400kΩ
23 T5IN
T5OUT
26 ENT
5 R1OUT
T5OUT
R1IN
5kΩ
R2OUT
6
R2IN
5kΩ
7 R3OUT
R3IN
5kΩ
22 R4OUT
R4IN
5kΩ
R5OUT
21
1 ENR
2 ENR
R5IN
5kΩ
GND GND
13 14
11
12
18
17
16
15
10
9
8
19
20
Figure 7. MAX225 Pin Configuration and Typical Operating Circuit
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Maxim Integrated | 18


MAX232 Datasheet PDF
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MAX220–MAX249
+5V-Powered, Multichannel
RS-232 Drivers/Receivers
TOP VIEW
+
T3OUT 1
T1OUT 2
T2OUT 3
R2IN 4
R2OUT 5
T2IN 6
T1IN 7
MAX223
MAX241
R1OUT 8
R1IN 9
GND 10
VCC 11
C1+ 12
V+ 13
C1- 14
Wide SO/
SSOP
28 T4OUT
27 R3IN
26 R3OUT
25 SHDN (SHDN)
24 EN (EN)
23 R4IN*
22 R4OUT*
21 T4IN
20 T3IN
19 R5OUT*
18 R5IN*
17 V-
16 C2-
15 C2+
*R4 AND R5 IN MAX223 REMAIN ACTIVE IN SHUTDOWN.
NOTE: PIN LABELS IN ( ) ARE FOR MAX241.
1.0μF
1.0μF
TTL/CMOS
INPUTS
+5V INPUT
1.0μF
12
C1+
14 C1-
15 C2+
16 C2-
11
VCC
+5V TO +10V
VOLTAGE DOUBLER
+10V TO -10V
VOLTAGE INVERTER
+5V
7 T1IN
400kΩ
T1
+5V
6 T2IN
+5V
400kΩ
T2
400kΩ
20 T3IN
T3
+5V
21 T4IN
400kΩ
T4
13
V+
V- 17
T1OUT 2
T2OUT 3
T3OUT 1
T4OUT 28
1.0μF
1.0μF
RS-232
OUTPUTS
8 R1OUT
5 R2OUT
LOGIC
OUTPUTS
26 R3OUT
22 R4OUT
19 R5OUT
24 EN (EN)
R1
R2
R3
R4
R5
GND
10
R1IN 9
5kΩ
R2IN 4
5kΩ
R3IN 27
5kΩ
R4IN 23
5kΩ
R5IN 18
5kΩ
SHDN 25
(SHDN)
RS-232
INPUTS
Figure 8. MAX223/MAX241 Pin Configuration and Typical Operating Circuit
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MAX220–MAX249
+5V-Powered, Multichannel
RS-232 Drivers/Receivers
TOP VIEW
+
T3OUT 1
T1OUT 2
T2OUT 3
T2IN 4
T1IN 5
MAX230
GND 6
VCC 7
C1+ 8
V+ 9
C1- 10
20 T4OUT
19 T5IN
18 N.C.
17 SHDN
16 T5OUT
15 T4IN
14 T3IN
13 V-
12 C2-
11 C2+
DIP/SO
+5V INPUT
1.0μF
1.0μF
1.0μF
TTL/CMOS
INPUTS
8 C1+
10 C1-
11 C2+
12
C2-
7
VCC
+5V TO +10V
V+
VOLTAGE DOUBLER
+10V TO -10V
VOLTAGE INVERTER V-
9
13
+5V
5 T1IN
+5V
4 T2IN
+5V
14 T3IN
+5V
15 T4IN
+5V
19 T5IN
400kΩ
T1
400kΩ
T2
400kΩ
T3
400kΩ
T4
400kΩ
T5
T1OUT 2
T2OUT 3
T3OUT 1
T4OUT 20
T5OUT 16
1.0μF
1.0μF
RS-232
OUTPUTS
N.C.x 18
GND
6
17 SHDN
Figure 9. MAX230 Pin Configuration and Typical Operating Circuit
TOP VIEW
+
C+ 1
C- 2
V- 3
T2OUT 4 MAX231
R2IN 5
R2OUT 6
T2IN 7
DIP
14 V+
+
C+ 1
13 VCC
12 GND
C- 2
V- 3
11 T1OUT T2OUT 4
MAX231
10 R1IN R2IN 5
9 R1OUT R2OUT 6
8 T1IN
T2IN 7
N.C. 8
SO
PIN NUMBERS IN ( ) ARE FOR SO PACKAGE.
1.0μF
+5V INPUT
+7.5V TO +12V
16 V+
15 VCC
14 GND
13 T1OUT
12 R1IN
11 R1OUT
10 T1IN
9 N.C.
1.0μF
1
C1+
2
C1-
+5V
(10)
8 T1IN
TTL/CMOS
INPUTS
+5V
7 T2IN
(11) 9 R1OUT
TTL/CMOS
OUTPUTS
6 R2OUT
13 (15)
VCC
+12V TO -12V
VOLTAGE CONVERTER
V+ 14
3
V-
(16)
C2
1.0μF
400kΩ
T1
(13)
T1OUT 11
400kΩ
T2
R1
R2
T2OUT 4
RS-232
OUTPUTS
R1IN 10 (12)
5kΩ
R2IN 5
5kΩ
RS-232
INPUTS
GND
12 (14)
Figure 10. MAX231 Pin Configurations and Typical Operating Circuit
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Maxim Integrated | 20


MAX232 Datasheet PDF
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MAX220–MAX249
+5V-Powered, Multichannel
RS-232 Drivers/Receivers
TOP VIEW
+
T2IN 1
T1IN 2
R1OUT 3
R1IN 4
T1OUT 5
GND 6
MAX233
MAX233A
VCC 7
(V+) C1+ 8
GND 9
(V-) CS- 10
20 R2OUT
19 R2IN
18 T2OUT
17 V-
16 C2-
15 C2+
14 V+ (C1-)
13 C1- (C1+)
12 V- (C2+)
11 C2+ (C2-)
DIP/SO
PIN NAMES IN ( ) ARE FOR SO PACKAGE.
TTL/CMOS
INPUTS
1.0μF
+5V
+5V INPUT
7
VCC
2 T1IN
400kΩ
+5V
400kΩ
1 T2IN
3 R1OUT
T1OUT 5
T2OUT 18
R1IN 4
RS-232
OUTPUTS
TTL/CMOS
OUTPUTS
20 R2OUT
DO NOT MAKE 8 (13) C1+
CONNECTIONS TO
THESE PINS
13 (14)
C1-
12 (10)
INTERNAL -10V
V-
POWER SUPPLY
17 V-
INTERNAL +10V 14 (8) V+
POWER SUPPLY
GND
6
5kΩ
R2IN 19
RS-232
INPUTS
5kΩ C2+ 11 (12)
15
C2+
16
C2-
10 (11)
CS-
GND
9
Figure 11. MAX233/MAX233A Pin Configuration and Typical Operating Circuit
TOP VIEW
+
T1OUT 1
T2OUT 2
T2IN 3
T1IN 4
MAX234
GND 5
VCC 6
C1+ 7
V+ 8
16 T3OUT
15 T4OUT
14 T4IN
13 T3IN
12 V-
11 C2-
10 C2+
9 C1-
DIP/SO
1.0μF
1.0μF
TTL/CMOS
INPUTS
+5V INPUT
1.0μF
7
C1+
9 C1-
10 C2+
11 C2-
4 T1IN
3 T2IN
13 T3IN
14 T4IN
6
VCC
+5V TO +10V
VOLTAGE DOUBLER
+10V TO -10V
VOLTAGE INVERTER
8
V+
12
V-
+5V
400kΩ
T1OUT 1
T1
+5V
400kΩ
T2OUT 2
T2
+5V
400kΩ
T3OUT 16
T3
+5V
400kΩ
T4
GND
5
T4OUT 15
1.0μF
1.0μF
RS-232
OUTPUTS
Figure 12. MAX234 Pin Configuration and Typical Operating Circuit
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MAX220–MAX249
+5V-Powered, Multichannel
RS-232 Drivers/Receivers
TOP VIEW
+
T4OUT 1
T3OUT 2
T1OUT 3
T2OUT 4
R2IN 5
MAX235
R2OUT 6
T2IN 7
T1IN 8
R1OUT 9
R1IN 10
GND 11
VCC 12
DIP
24 R3IN
23 R3OUT
22 T5IN
21 SHDN
20 EN
19 T5OUT
18 R4IN
17 R4OUT
16 T4IN
15 T3IN
14 R5OUT
13 R5IN
TTL/CMOS
INPUTS
+5V INPUT
1.0μF
+5V
8 T1IN
12
VCC
400kΩ
T1
+5V
7 T2IN
+5V
15 T3IN
+5V
16 T4IN
+5V
22 T5IN
400kΩ
T2
400kΩ
T3
400kΩ
T4
400kΩ
T5
T1OUT 3
T2OUT 4
T3OUT 2
T4OUT 1
T5OUT 19
RS-232
OUTPUTS
9 R1OUT
6 R2OUT
TTL/CMOS
OUTPUTS
23 R3OUT
17 R4OUT
14 R5OUT
20 EN
T1 R1IN 10
5kΩ
R2 R2IN 5
5kΩ
R3IN 24
R3
5kΩ
R4 R4IN 18
5kΩ
R5
GND
11
R5IN 13
5kΩ
21
SHDN
RS-232
INPUTS
Figure 13. MAX235 Pin Configuration and Typical Operating Circuit
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Maxim Integrated | 22


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MAX220–MAX249
+5V-Powered, Multichannel
RS-232 Drivers/Receivers
TOP VIEW
+
T3OUT 1
T1OUT 2
T2OUT 3
R1IN 4
R1OUT 5
MAX236
T2IN 6
T1IN 7
GND 8
VCC 9
C1+ 10
V+ 11
C1- 12
DIP/SO
24 T4OUT
23 R2IN
22 R2OUT
21 SHDN
20 EN
19 T4IN
18 T3IN
17 R3OUT
16 R3IN
15 V-
14 C2-
13 C2+
1.0μF
1.0μF
TTL/CMOS
INPUTS
+5V INPUT
1.0μF
10
C1+
12 C1-
13 C2+
14 C2-
9
VCC
+5V TO +10V
VOLTAGE DOUBLER
+10V TO -10V
VOLTAGE INVERTER
11
V+
1.0μF
15
V-
1.0μF
+5V
7 T1IN
400kΩ
T1
T1OUT 2
+5V
6 T2IN
400kΩ
T2
+5V
18 T3IN
400kΩ
T3
+5V
19 T4IN
400kΩ
T4
T2OUT 3
T3OUT 1
RS-232
OUTPUTS
T4OUT 24
5 R1OUT
TTL/CMOS
OUTPUTS
22 R2OUT
17 R3OUT
20 EN
R1 R1IN 4
5kΩ
R2 R2IN 23
5kΩ
R3 R3IN 16
5kΩ
SHDN 21
GND
8
RS-232
INPUTS
Figure 14. MAX236 Pin Configuration and Typical Operating Circuit
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Maxim Integrated | 23


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MAX220–MAX249
+5V-Powered, Multichannel
RS-232 Drivers/Receivers
TOP VIEW
+
T3OUT 1
T1OUT 2
T2OUT 3
R1IN 4
R1OUT 5
MAX237
T2IN 6
T1IN 7
GND 8
VCC 9
C1+ 10
V+ 11
C1- 12
DIP/SO
24 T4OUT
23 R2IN
22 R2OUT
21 T5IN
20 T5OUT
19 T4IN
18 T3IN
17 R3OUT
16 R3IN
15 V-
14 C2-
13 C2+
1.0μF
1.0μF
TTL/CMOS
INPUTS
+5V INPUT
1.0μF
10
C1+
12 C1-
13 C2+
14 C2-
+5V
9
VCC
+5V TO +10V
VOLTAGE DOUBLER
+10V TO -10V
VOLTAGE INVERTER
400kΩ
V+ 11
15
V-
7 T1IN
+5V
6 T2IN
+5V
T1
400kΩ
T2
400kΩ
T1OUT 2
T2OUT 3
18 T3IN
+5V
T3
400kΩ
T3OUT 1
19 T4IN
+5V
T4
400kΩ
T4OUT 24
21 T5IN
T5OUT 20
T5
1.0μF
1.0μF
RS-232
OUTPUTS
5 R1OUT
TTL/CMOS
OUTPUTS
22 R2OUT
17 R3OUT
R1
R2
R3
GND
8
R1IN 4
5kΩ
R2IN 23
5kΩ
R3IN 16
5kΩ
RS-232
INPUTS
Figure 15. MAX237 Pin Configuration and Typical Operating Circuit
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Maxim Integrated | 24


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MAX220–MAX249
+5V-Powered, Multichannel
RS-232 Drivers/Receivers
TOP VIEW
+
T2OUT 1
T1OUT 2
R2IN 3
R2OUT 4
T1IN 5
MAX238
R1OUT 6
R1IN 7
GND 8
VCC 9
C1+ 10
V+ 11
C1- 12
DIP/SO
24 T3OUT
23 R3IN
22 R3OUT
21 T4IN
20 T4OUT
19 T3IN
18 T2IN
17 R4OUT
16 R4IN
15 V-
14 C2-
13 C2+
1.0μF
1.0μF
TTL/CMOS
INPUTS
+5V INPUT
1.0μF
10
C1+
12 C1-
13 C2+
14 C2-
9
VCC
+5V TO +10V
VOLTAGE DOUBLER
+10V TO -10V
VOLTAGE INVERTER
+5V
400kΩ
5 T1IN
+5V
T1
400kΩ
18 T2IN
+5V
T2
400kΩ
19 T3IN
+5V
T3
400kΩ
21 T4IN
T4
V+ 11
V- 15
T1OUT 2
T2OUT 1
T3OUT 24
T4OUT 20
1.0μF
1.0μF
RS-232
OUTPUTS
6 R1OUT
TTL/CMOS
OUTPUTS
4 R2OUT
22 R3OUT
17 R4OUT
R1 R1IN 7
5kΩ
R2 R2IN 3
5kΩ RS-232
INPUTS
R3 R3IN 23
5kΩ
R4 R4IN 16
5kΩ
GND
8
Figure 16. MAX238 Pin Configuration and Typical Operating Circuit
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MAX220–MAX249
+5V-Powered, Multichannel
RS-232 Drivers/Receivers
TOP VIEW
+
R1OUT 1
R1IN 2
GND 3
VCC 4
V+ 5
MAX239
C+ 6
C- 7
V- 8
R5IN 9
R5OUT 10
R4OUT 11
R4IN 12
DIP/SO
24 T1IN
23 T2IN
22 R2OUT
21 R2IN
20 T2OUT
19 T1OUT
18 R3IN
17 R3OUT
16 T3IN
15 N.C.
14 EN
13 T3OUT
1.0μF
TTL/CMOS
INPUTS
+5V INPUT
1.0μF
+7.5V TO +13.2V
INPUT
6 C1+
7 C1-
45
VCC V+
+10V TO -10V
VOLTAGE INVERTER
V- 8
1.0μF
+5V
24 T1IN
+5V
23 T2IN
+5V
16 T3IN
400kΩ
T1
400kΩ
T2
400kΩ
T3
T1OUT 19
T2OUT 20
RS-232
OUTPUTS
T3OUT 13
1 R1OUT
22 R2OUT
TTL/CMOS
OUTPUTS
17 R3OUT
11 R4OUT
10 R5OUT
14 EN
R1 R1IN 2
5kΩ
R2 R2IN 21
5kΩ
R3
R3IN 18
RS-232
INPUTS
5kΩ
R4 R4IN 12
5kΩ
R5 R5IN 9
5kΩ
N.C. 15
GND
3
Figure 17. MAX239 Pin Configuration and Typical Operating Circuit
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MAX220–MAX249
+5V-Powered, Multichannel
RS-232 Drivers/Receivers
TOP VIEW
N.C.
R2OUT
T2IN
T1IN
R1OUT
R1IN
GND
VCC
N.C.
N.C.
N.C.
12
13
14
15
16
17
18
19
20
21
22
MAX240
Plastic FP
+
44
43
42
41
40
39
38
37
36
35
34
1.0μF
1.0μF
TTL/CMOS
INPUTS
N.C.
SHDN
EN
T5OUT
R4IN
R4OUT
T4IN
T3IN
R5OUT
R5IN
N.C.
TTL/CMOS
OUTPUTS
+5V INPUT
1.0μF
25
C1+
27 C1-
28 C2+
29 C2-
19
VCC
+5V TO +10V
VOLTAGE DOUBLER
+5V TO -10V
VOLTAGE INVERTER
+5V
15 T1IN
400kΩ
T1
+5V
400kΩ
14 T2IN
+5V
T2
400kΩ
37 T3IN
T3
+5V
38 T4IN
+5V
2 T5IN
400kΩ
T4
400kΩ
T5
26
V+
V- 30
T1OUT 7
T2OUT 8
T3OUT 6
T4OUT 5
T5OUT 41
1.0μF
1.0μF
RS-232
OUTPUTS
16 R1OUT
R1 R1IN 17
5kΩ
13 R2OUT
3 R3OUT
R2 R2IN 10
5kΩ
R3
R3IN 4
RS-232
INPUTS
5kΩ
39 R4OUT
36 R5OUT
42 EN
R4 R4IN 40
5kΩ
R5 R5IN 35
5kΩ
SHDN 43
GND
18
Figure 18. MAX240 Pin Configuration and Typical Operating Circuit
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MAX220–MAX249
+5V-Powered, Multichannel
RS-232 Drivers/Receivers
TOP VIEW
+5V INPUT
0.1μF
0.1μF
+
C1+ 1
V+ 2
C1- 3
C2+ 4 MAX243
C2- 5
V- 6
T2OUT 7
R2IN 8
16 VCC
15 GND
14 T1OUT
13 R1IN
12 R1OUT
11 T1IN
10 T2IN
9 R2OUT
0.1μF
0.1μF
TTL/CMOS
INPUTS
1
C1+
3 C1-
4 C2+
5 C2-
11 T1IN
10 T2IN
16
VCC
+5V TO +10V
VOLTAGE DOUBLER
+10V TO -10V
VOLTAGE INVERTER
+5V
400kΩ
+5V
400kΩ
V+ 2 +10V
6
V-
-10V
0.1μF
T1OUT 14
T2OUT 7
RS-232
OUTPUTS
DIP/SO
12 R1OUT
R1IN 13
TTL/CMOS
OUTPUTS
RECEIVER INPUT
-3V
OPEN
+3V
R1 OUTPUT
HIGH
HIGH
LOW
R2 OUTPUT
HIGH
LOW
LOW
9 R2OUT
5kΩ
R2IN 8
GND
15
5kΩ
RS-232
INPUTS
Figure 19. MAX243 Pin Configuration and Typical Operating Circuit
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MAX232 Datasheet PDF
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MAX220–MAX249
+5V-Powered, Multichannel
RS-232 Drivers/Receivers
TOP VIEW
6 5 4 3 2 1 44 43 42 41 40
+
1μF
1μF
RA3IN 7
RA2IN 8
RA1IN 9
RA1OUT 10
RA2OUT 11
RA3OUT 12
RA4OUT 13
RA5OUT 14
TA1IN 15
TA2IN 16
TA3IN 17
MAX244
39 RB4IN
38 RB3IN
37 RB2IN
36 RB1IN
35 RB1OUT
34 RB2OUT
33 RB3OUT
32 RB4OUT
31 RB5OUT
30 TB1IN
29 TB2IN
18 19 20 21 22 23 24 25 26 27 28
PLCC
MAX249 FUNCTIONAL DESCRIPTION
10 RECEIVERS
5 A-SIDE RECEIVERS
5 B-SIDE RECEIVERS
8 TRANSMITTERS
4 A-SIDE TRANSMITTERS
4 B-SIDE TRANSMITTERS
NO CONTROL PINS
21
C1+
23 C1-
24
C2+
25 C2-
2 TA1OUT
15 TA1IN
+5V
1μF
1μF
20
VCC
+5V TO +10V VOLTAGE DOUBLER
+10V TO -10V VOLTAGE INVERTER
22
V+ 26
V- 1μF
+5V +5V TB1OUT 44
400kΩ
TB1IN 30
2 TA2OUT
16 TA2IN
+5V +5V
400kΩ
TB2OUT 43
TB2IN 29
3 TA3OUT
17 TA3IN
4 TA4OUT
18 TA4IN
9 RA1IN
+5V +5V
400kΩ
+5V +5V
400kΩ
TB3OUT 42
TB3IN 28
TB4OUT 41
TB4IN 27
RB1IN 36
5kΩ
10 RA1OUT
8 RA2IN
5kΩ
RB1OUT 35
RB2IN 37
5kΩ
11 RA2OUT
7 RA3IN
5kΩ
RB2OUT 34
RB3IN 38
5kΩ
12 RA3OUT
6 RA4IN
5kΩ
RB3OUT 33
RB4IN 39
5kΩ
13 RA4OUT
5 RA5IN
5kΩ
RB4OUT 32
RB5IN 40
5kΩ 5kΩ
14 RA5OUT
GND
19
RB5OUT 31
Figure 20. MAX244 Pin Configuration and Typical Operating Circuit
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MAX232 Datasheet PDF
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MAX220–MAX249
+5V-Powered, Multichannel
RS-232 Drivers/Receivers
TOP VIEW
+
ENR 1
TA1IN 2
TA2IN 3
TA3IN 4
TA4IN 5
RA5OUT 6
RA4OUT 7
MAX245
RA3OUT 8
RA2OUT 9
RA1OUT 10
RA1IN 11
RA2IN 12
RA3IN 13
RA4IN 14
RA5IN 15
TA1OUT 16
TA2OUT 17
TA3OUT 18
TA4OUT 19
GND 20
DIP
40 VCC
39 ENT
38 TB1IN
37 TB2IN
36 TB3IN
35 TB4IN
34 RB5OUT
33 RB4OUT
32 RB3OUT
31 RB2OUT
30 RB1OUT
29 RB1IN
28 RB2IN
27 RB3IN
26 RB4IN
25 RB5IN
24 TB1OUT
23 TB2OUT
22 TB3OUT
21 TB4OUT
MAX245 FUNCTIONAL DESCRIPTION
10 RECEIVERS
5 A-SIDE RECEIVERS (RA5 ALWAYS ACTIVE)
5 B-SIDE RECEIVERS (RB5 ALWAYS ACTIVE)
8 TRANSMITTTERS
4 A-SIDE TRANSMITTERS
2 CONTROL PINS
1 RECEIVER ENABLE (ENR)
1 TRANSMITTER ENABLE (ENT)
Figure 21. MAX245 Pin Configuration and Typical Operating Circuit
+5V
16 TA1OUT
2 TA1IN
1μF
+5V
40
VCC
+5V
400kΩ
17 TA2OUT
3 TA2IN
+5V +5V
400kΩ
18 TA3OUT
4 TA3IN
19 TA4OUT
5 TA4IN
+5V +5V
400kΩ
+5V +5V
400kΩ
1 ENR
11 RA1IN
5kΩ
10 RA1OUT
12 RA2IN
5kΩ
9 RA2OUT
13 RA3IN
5kΩ
8 RA3OUT
14 RA4IN
5kΩ
7 RA4OUT
15 RA5IN
5kΩ
6 RA5OUT
GND
20
TB1OUT 24
TB1IN 38
TB2OUT 23
TB2IN 37
TB3OUT 22
TB3IN 36
TB4OUT 21
TB4IN 35
ENT 39
RB1IN 29
5kΩ
RB1OUT 30
RB2IN 28
5kΩ
RB2OUT 31
RB3IN 27
5kΩ
RB3OUT 32
RB4IN 26
5kΩ
RB4OUT 33
RB5IN 25
5kΩ
RB5OUT 34
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