UM488_15 Datasheet, PDF (9/17 Pages) Union Semiconductor, Inc. – Enhanced Slew-Rate Limiting Facilitates Error-Free Data Transmission

UM488/UM491
Typical Operating Circuit
DE
VCC
4
14
5
DI
D
9
Y
10
Z
2
RO
1,8,13
NC
12 A
R
11
Rt
B
3
6,7
RE GND
VCC RE
Rt
R
RO
D
DI
GND
DE
Figure 1: UM491 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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http://www.union-ic.com Rev.05 Dec.2014
9/17