ST490AB Datasheet, PDF (1/17 Pages) STMicroelectronics – Low power high speed RS-485/RS-422 transceiver

Features
■ Low supply current: 5 mA max
■ -7 V to 12 V common mode input voltage range
■ 70 mV typical input hysteresis
■ Designed for 25 Mbps operation
■ Operate from a single 5 V supply
■ ±4 kV ESD protection
■ Current limiting and thermal shutdown for
driver overload protection
Description
The ST490A 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 ST490A draws 5 mA (typ.) of
supply current when unloaded or fully loaded with
disabled drivers. It operates from a single 5 V
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.
ST490AB
Low power high speed
RS-485/RS-422 transceiver
DIP-8
SO-8
Table 1. Device summary
Order code Temperature range
ST490ABN
-40 to 85 °C
ST490ABDR
-40 to 85 °C
February 2008
Package
DIP-8
SO-8 (tape and reel)
Rev 5
Packaging
50 parts per tube / 40 tube per box
2500 parts per reel
1/17
www.st.com
17