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MAX3480B Datasheet

RS-485/RS-422 Data Interface

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MAX3480B pdf
19-0453; Rev 0; 1/96
Complete, Isolated, 3.3V
RS-485/RS-422 Data Interface
_______________General Description
The MAX3480A/MAX3480B are electrically isolated
RS-485/RS-422 data-communications interfaces.
Transceivers, optocouplers, and a transformer are all
included in one low-cost, 28-pin DIP package. A single
+3.3V supply on the logic side powers both sides of the
interface.
The MAX3480B features reduced-slew-rate drivers that
minimize EMI and reduce reflections caused by
improperly terminated cables, allowing error-free data
transmission at data rates up to 250kbps. The
MAX3480A’s driver slew rate is not limited, allowing
transmission rates up to 2.5Mbps.
These devices typically draw 180mA of quiescent sup-
ply current. The MAX3480B provides a low-power shut-
down mode in which it consumes only 0.2µA.
Drivers are short-circuit current limited and are protect-
ed against excessive power dissipation by thermal
shutdown circuitry that places the driver outputs into a
high-impedance state. The receiver input has a fail-safe
feature that guarantees a logic-high output if the input
is open circuit.
The MAX3480A/MAX3480B typically withstand 1600VRMS
(1 minute) or 2000VRMS (1 second). Their isolated inputs
and outputs meet RS-485/RS-422 specifications.
________________________Applications
Isolated RS-485/RS-422 Data Interface
Transceivers for EMI-Sensitive Applications
Industrial-Control Local Area Networks
Automatic Test Equipment
HVAC/Building Control Networks
______________Ordering Information
PART
MAX3480ACPI
MAX3480AEPI
MAX3480BCPI
MAX3480BEPI
TEMP. RANGE PIN-PACKAGE
0°C to +70°C
-40°C to +85°C
0°C to +70°C
-40°C to +85°C
28 Plastic DIP
28 Plastic DIP
28 Plastic DIP
28 Plastic DIP
DATA
RATE
(kbps)
2500
2500
250
250
____________________________Features
o Isolated Data Interface to 1600VRMS (1 minute)
o Slew-Rate-Limited Data Transmission (MAX3480B)
o High-Speed, Isolated, 2.5Mbps RS-485 Interface
(MAX3480A)
o -7V to +12V Common-Mode Input Voltage Range
with Respect to Isolated Ground
o Single +3.3V Supply
o Current Limiting and Thermal Shutdown for
Driver Overload Protection
o Standard 28-Pin DIP Package
__________________Pin Configuration
TOP VIEW
VCC1 1
VCC2 2
D1 3
D2 4
GND1 5
FS 6
MAX845
SD 7
VCC3 8
DI 9
VCC4 10
DE 11
GND2 12
RO 13
VCC5 14
MAX3480A/B
MAX485
MAX487
28 AC1
27 AC2
26 ISO VCC1
25 B
24 ISO RO DRV
23 A
22 ISO DI IN
21 ISO DE IN
20 ISO COM1
19 ISO DI DRV
18 ISO VCC2
17 ISO DE DRV
16 ISO COM2
15 ISO RO LED
ISOLATION BARRIER
DIP
________________________________________________________________ Maxim Integrated Products 1
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800
Maxim Integrated
Maxim Integrated



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