ST491A Datasheet, PDF (1/12 Pages) STMicroelectronics – LOW POWER HIGH SPEED RS-485/RS-422 TRANSCEIVER

ST491A
LOW POWER HIGH SPEED RS-485/RS-422 TRANSCEIVER
s LOW SUPPLY CURRENT: 5mA MAX
s DESIGNED FOR RS485 INTERFACE
APPLICATIONS
s -7 TO 12 COMMON MODE INPUT VOLTAGE
RANGE
s 70mV TYPICAL INPUT HYSTERESIS
s DESIGNED FOR 25Mbps OPERATION
s OPERATE FROM SINGLE 5 SUPPLY
s ±4kV ESD PROTECTION
s CURRENT LIMITING AND THERMAL
SHUTDOWN FOR DRIVER OVERLOAD
PROTECTION
DESCRIPTION
The ST491A is a low power transceiver for
RS-485 and RS-422 communications. The device
contains one driver and one receiver in full duplex
configuration. The ST491A draws 5mA (typ.) of
supply current when unloaded and operates from
a single 5V supply.
DIP
SOP
Driver is short-circuit current limited and is
protected against excessive power dissipation by
thermal shutdown circuitry that place the driver
outputs into a high-impedance state. The receiver
input has a fail-safe feature that guarantees a
logic high output if both inputs are open circuit.
ORDERING CODES
Type
ST491ACN
ST491ABN
ST491ACD
ST491ABD
ST491ACDR
ST491ABDR
Temperature
Range
0 to 70 °C
-40 to 85 °C
0 to 70 °C
-40 to 85 °C
0 to 70 °C
-40 to 85 °C
Package
DIP-14
DIP-14
SO-14 (Tube)
SO-14 (Tube)
SO-14 (Tape & Reel)
SO-14 (Tape & Reel)
Comments
25parts per tube / 40tube per box
25parts per tube / 40tube per box
50parts per tube / 20tube per box
50parts per tube / 20tube per box
2500 parts per reel
2500 parts per reel
July 2003
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