ST490AB Просмотр технического описания (PDF) - STMicroelectronics

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ST490AB

Low power high speed RS-485/RS-422 transceiver

STMicroelectronics 

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

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