ST491A_07 Datasheet, PDF (1/17 Pages) STMicroelectronics – Low power high speed RS-485/RS-422 transceiver

Features
■ Low supply current: 5mA max
■ Designed for RS485 interface applications
■ -7V to 12V common mode input voltage range
■ 70mV typical input hysteresis
■ Designed for 25Mbps operation
■ Operate from a single 5V supply
■ ±4kV ESD protection
■ 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.
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.
ST491A
Low power high speed
RS-485/RS-422 transceiver
DIP-14
Order code
Part number Temperature range
ST491ACN
0 to 70 °C
May 2007
Package
DIP-14
Rev 6
Packaging
25parts per tube / 40tube per box
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www.st.com
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