DS78C120

Dual CMOS Compatible Differential Line Receiver

General Description

The DS78C120 is a high performance, dual differential,

CMOS compatible line receiver for both balanced and unbal-

anced digital data transmission. The inputs are compatible

with EIA, Federal and MIL standards.

Input specifications meet or exceed those of the popular

DS7820 line receiver.

Circuit features include hysteresis and response control for

applications where controlled rise and fall times and/or high

frequency noise rejection are desirable. Threshold offset

control is provided for fail-safe detection, should the input be

open or short. Each receiver includes a 180

Ω terminating re-

sistor and the output gate contains a logic strobe for time dis-

crimination. The DS78C120 is specified over a −55˚C to

+125˚C temperature range.

Features

n Full compatibility with EIA Standards RS232-C, RS422

and RS423, Federal Standards 1020, 1030 and

MIL-188-114

common-mode)

n Separate strobe input for each receiver

n 5k typical input impedance

n 50 mV input hysteresis

n 200 mV input threshold

n Operation voltage range = 4.5V to 15V

n Separate fail-safe mode

Connection Diagram

Dual-In-Line Package

DS005801-1

Top View

For Complete Military Product Specifications,

refer to the appropriate SMD or MDS.

Order Number DS78C120J/883

See NS Package Number J16A

May 1999

© 1999 National Semiconductor Corporation

DS005801

www.national.com