1 Features

• Meets or exceeds the requirements of ANSI EIA/

TIA-422-B and RS-485

• High-speed advanced low-power Schottky circuitry

• Designed for up to 20Mbit/s operation in both

serial and parallel applications

• Designed for multipoint transmission on long bus

lines in noisy environments

• Low supply current requirements 55mA max

• Wide positive and negative input/output bus

voltage ranges

• Driver output capacity: 60mA

• Thermal-shutdown protection

• Driver positive- and negative-current limiting

2 Applications

• Motor drives

• Factory automation and control

3 Description

The SN75ALS174 is a quadruple line driver with

tri-state differential outputs. It is designed to meet

the requirements of ANSI Standards EIA/TIA-422-B

and RS-485. This device is optimized for balanced

multipoint bus transmission at rates of up to 20Mbit/s.

Each driver features wide positive and negative

common-mode output voltage ranges that make

them suitable for party-line applications in noisy

environments.

The SN75ALS174 provides positive- and negativecurrent

limiting and thermal shutdown for protection

from line fault conditions on the transmission bus

line. Shutdown occurs at a junction temperature of

approximately 150°C.

The SN75ALS174 is characterized for operation from

0°C to 70°C.