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.