Document
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SP490E/SP491E
Enhanced Full Duplex RS-485 Transceivers
+5V Only Low Power BiCMOS Driver/Receiver Enable (SP491E) RS-485 and RS-422 Drivers/Receivers Pin Compatible with LTC490 and SN75179 (SP490E) s Pin Compatible with LTC491 and SN75180 (SP491E) s Improved ESD Specifications: ±15kV Human Body Model ±15kV IEC1000-4-2 Air Discharge ±8kV IEC1000-4-2 Contact Discharge DESCRIPTION… The SP490E is a low power differential line driver/receiver meeting RS-485 and RS-422 standards up to 10Mbps. The SP491E is identical to the SP490E with the addition of driver and receiver tri-state enable lines. Both products feature ±200mV receiver input sensitivity, over wide common mode range. The SP490E is available in 8-pin plastic DIP and 8-pin NSOIC packages for operation over the commercial and industrial temperature ranges. The SP491E is available in 14-pin DIP and 14-pin NSOIC packages for operation over the commercial and industrial temperature ranges. s s s s s
NC 1
14 Vcc 13 NC 12 A
Vcc 1 R 2
R 2
8 A
R
11 B
R
REB 3
7 B
DE 4
6 Z D 3 GND 4
10 Z D 5
D
5 Y
D
GND 6 GND 7
9 Y 8 NC
SP490E
SP491E
SP490EDS/14
SP490E Enhanced Full Duplex RS-485 Transceivers
© Copyright 2000 Sipex Corporation
1
ABSOLUTE MAXIMUM RATINGS
These are stress ratings only and functional operation of the device at these ratings or any other above those indicated in the operation sections of the specifications below is not implied. Exposure to absolute maximum rating conditions for extended periods of time may affect reliability. VCC....................................................................................................+7V Input Voltages Drivers................................................-0.5V to (VCC+0.5V) Receivers..................................................................±14V Output Voltages Drivers......................................................................±14V Receivers...........................................-0.5V to (VCC+0.5V) Storage Temperature....................................................-65˚C to +150˚ Power Dissipation.....................................................................1000mW
SPECIFICATIONS
TMIN to TMAX and VCC = 5V ± 5% unless otherwise noted.
PARAMETERS SP490E DRIVER DC Characteristics Differential Output Voltage Differential Output Voltage Differential Output Voltage Change in Magnitude of Driver Differential Output Voltage for Complimentary States Driver Common-Mode Output Voltage Input High Voltage Input Low Voltage Input Current Driver Short-Circuit Current VOUT = HIGH VOUT = LOW SP490E DRIVER AC Characteristics Maximum Data Rate Driver Input to Output Driver Input to Output Driver Skew Driver Rise or Fall Time
MIN.
TYP.
MAX.
UNITS
CONDITIONS
GND 2 1.5
VCC VCC VCC 0.2 3
Volts Volts Volts Volts Volts Volts Volts µA mA mA
Unloaded; R = ∞; see Figure 1 With Load; R = 50Ω; (RS-422); see Figure 1 With Load; R = 27Ω; (RS-485); see Figure 1 R = 27Ω or R = 50Ω; see Figure 1 R = 27Ω or R = 50Ω; see Figure 1 Applies to D Applies to D Applies to D -7V ≤ VO ≤ +12V -7V ≤ VO ≤ +12V
2.0 0.8 ±10 ±250 ±250
10 20 20
30 30 5
60 60
Mbps ns ns ns
3
15
40
ns
RDIFF = 54Ω, CL1 = CL2 = 100pF tPLH; RDIFF = 54Ω, CL1 = CL2 = 100pF; see Figures 3 and 6 tPHL; RDIFF = 54Ω, CL1 = CL2 = 100pF; see Figures 3 and 5 see Figures 3 and 5, tSKEW = | tDPLH - tDPHL| From 10% to 90%; RDIFF = 54Ω, CL1 = CL2 = 100pF; see Figures 3 and 5
SP490E RECEIVER DC Characteristics Differential Input Threshold -0.2 Input Hysteresis Output Voltage High 3.5 Output Voltage Low Input Resistance 12 Input Current (A, B); VIN = 12V Input Current (A, B); VIN = -7V Short-Circuit Current
+0.2 70 0.4 15 ±1.0 -0.8 85
Volts mV Volts Volts kΩ mA mA mA
-7V ≤ VCM ≤ 12V VCM = 0V IO = -4mA, VID = +200mV IO = +4mA, VID = -200mV -7V ≤ VCM ≤ 12V VIN = 12V VIN = -7V 0V ≤ VO ≤ VCC
SP490EDS/14
SP490E Enhanced Full Duplex RS-485 Transceivers
© Copyright 2000 Sipex Corporation
2
SPECIFICATIONS (continued)
TMIN to TMAX and VCC = 5V ± 5% unless otherwise noted.
PARAMETERS SP490E RECEIVER AC Characteristics Maximum Data Rate Receiver Input to Output Receiver Input to Output Diff. Receiver Skew ItPLH-tPHLI POWER REQUIREMENTS Supply Voltage Supply Current ENVIRONMENTAL AND MECHANICAL Operating Temperature Commercial (_C_) Industrial (_E_) Storage Temperature Package Plastic DIP (_P) NSOIC (_N)
MIN.
TYP.
MAX.
UNITS
CONDITIONS
10 20 20
45 45 13
100 100
Mbps ns ns ns
tPLH; RDIFF = 54Ω, CL1 = CL2 = 100pF; Figures 3 & 7 tPHL; RDIFF = 54Ω, CL1 = CL2 = 100pF; Figures 3 & 7 RDIFF = 54Ω; CL1 = CL2 = 100pF;
Figures 3 & 7
+4.75 900
+5.25
Volts µA
0 -40 -65
+70 +85 +150
°C °C °C
A R VOD R B VOC
S2 Receiver Output CRL Test Point S1 1k 1k VCC
Figure 1. Driver DC Test Load Circuit
Figure 2. Receiver Timing Test Load Circuit
3V DE DI A B CL2 RDIFF CL1 A RO B 15pF
Output Under Test
500 CL
S1
VCC
S2
Figure 3. Driver/Receiver Timing Test Circuit
Figure 4. Driver Timing Test Load #2 Circuit
SP490EDS/14
.