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Part Name
Description
ST485B(2009) View Datasheet(PDF) - STMicroelectronics
Part Name
Description
Manufacturer
ST485B
(Rev.:2009)
Low power RS-485/RS-422 transceiver
STMicroelectronics
ST485B Datasheet PDF : 12 Pages
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Truth tables
2
Truth tables
Table 3.
Truth table (driver)
Inputs
RE
DE
DI
X
H
H
X
H
L
X
L
X
Note:
X = Don’t care; Z = High impedance
Table 4.
Truth table (receiver)
Inputs
RE
DE
A-B
L
L
≥
+0.2V
L
L
≤
-0.2V
L
L
Inputs open
H
L
X
Note:
X = Don’t care; Z = High impedance
ST485B - ST485C
Outputs
B
A
L
H
H
L
Z
Z
Outputs
RO
H
L
H
Z
4/19
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