DS78LS120QML Datasheet, PDF (7/12 Pages) Texas Instruments – Dual Differential Line Receiver (Noise Filtering and Fail-Safe)

DS78LS120 is OBSOLETE
DS78LS120QML, DS78LS120
www.ti.com
SNLS370C – SEPTEMBER 1999 – REVISED APRIL 2013
For unbalanced operation, the receiver would be in an indeterminate logic state if the offset control input was
open. Connecting the fail-safe offset pin to 5V, offsets the receiver threshold to 0.45V. The output is forced to a
logic zero state if the input is open or shorted.
Figure 8. Unbalanced RS-423 and RS-232 Fail-Safe
Figure 9. Balanced RS-422 Fail-Safe
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