FEATURES

? Meets EIA Standards RS232-C, RS422 and

RS423, Federal Standards 1020, 1030 and MIL-

188-114

? Input Voltage Range of ±15V (Differential or

Common-mode)

? Separate Strobe Input for Each Receiver

? 5k Typical Input Impedance

? Optional 180Ω Termination Resistor

? 50mV Input Hysteresis

? 200mV Input Threshold

? Separate Fail-safe Mode

DESCRIPTION

The DS78LS120QML is a high performance, dual

differential, TTL compatible line receiver for both

balanced and unbalanced digital data transmission.

The inputs are compatible with EIA, Federal and MIL

standards.

The line receiver will discriminate a ±200 mV input

signal over a common-mode range of ±10V and a

±300 mV signal over a range of ±15V.

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 an optional 180Ω terminating

resistor and the output gate contains a logic strobe

for time discrimination. The DS78LS120QML is

specified over a ?55°C to +125°C temperature range.

Input specifications meet or exceed those of the

popular DS7820 line receiver.