UM3491 Datasheet, PDF (8/14 Pages) Union Semiconductor, Inc. – +3.3V Low Power，±15kV ESD-Protected, Fail-Safe, RS-422 Transceivers in SOP14/DIP14

Typical Operating Circuit
UM3491
Figure 1: UM3491 pin configuration and typical full-duplex operating circuit
A _120ohm
RO
R
RE
B
DE
Z _120ohm
DI
D
Y
Y ZB A
R
D
120ohm ^Y
D
DI
Z
120ohm ^B
DE
RE
R
RO
Y ZB A
A
R
D
DI DE RERO
DI DE RERO
Figure 2: Typical Full-Duplex RS-422 Network
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