DS78C20/DS88C20

Dual CMOS Compatible Differential Line Receiver

General Description

The DS78C20 and DS88C20 are high performance, dual dif-

ferential, CMOS compatible line receivers for both balanced

and unbalanced digital data transmission. The inputs are

compatible with EIA and Federal Standards.

Input specifications meet or exceed those of the popular

DS7820/DS8820 line receiver, and the pinout is identical.

A response pin is provided for controlling sensitivity to input

noise spikes with an external capacitor. Each receiver in-

cludes a 180

Ω terminating resistor, which may be used op-

tionally on twisted pair lines. The DS78C20 is specified over

a −55˚C to +125˚C operating temperature range, and the

DS88C20 over a 0˚C to +70˚C range.

Features

n Meets requirements of EIA Standards RS-232-C RS-422

and RS-423, and Federal Standards 1020 and 1030

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 DS7830/DS8830 recommended driver

Connection Diagram

Dual-In-Line Package

DS005798-1

Top View

Order Number DS88C20N

See NS Package Numbers N14A

For Complete Military Product Specifications,

refer to the appropriate SMD or MDS.

Order Number DS78C20J/883

See NS Package Number J14A

May 1998

© 1998 National Semiconductor Corporation

DS005798

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