Low-Power, Slew-Rate-Limited
RS-485/RS-422 Transceivers
A
Y
120Ω
120Ω
120Ω
RO
RE
R
DI
D
B
Z
Z
DE
DE
B
RE
RO
120Ω
DI
R
D
Y
A
Y
Z
B
A
Y
Z
B
A
R
R
D
D
MAX489
MAX491
DI
DE RE RO
DI
DE RE RO
NOTE: RE AND DE ON MAX489/MAX491 ONLY.
Figure 22. MAX488–MAX491 Full-Duplex RS-485 Network
Isolated RS-485
For isolated RS-485 applications, see the MAX253 and
MAX1480 data sheets.
MAX488–MAX491
A
RO
RE
DE
120Ω
120Ω
R
DATA IN
B
Z
DI
DATA OUT
D
Y
NOTE: RE AND DE ON MAX489/MAX491 ONLY.
Figure 23. Line Repeater for MAX488–MAX491
14 ______________________________________________________________________________________