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UM3243 Datasheet(PDF) 10 Page - Union Semiconductor, Inc.

Part No. UM3243
Description  Low Supply Current, 3V to 5.5V, 250kbps, 3-Driver/5-Receiver, Enhanced ESD Protection Smart RS-232 Transceivers
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Maker  UNIONSEMI [Union Semiconductor, Inc.]
Homepage  http://www.union-ic.com
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UM3243 Datasheet(HTML) 10 Page - Union Semiconductor, Inc.

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http://www.union-ic.com Rev.01 Mar.2015
10/22
UM3243
Function Tables
Table 1. Each Transmitter (Note 2)
INPUTS
OUTPUT
TRANSMITTER STATUS
TIN
FORCEON
FORCEOFF
______________________
VALID RIN
RS-232 LEVEL
TOUT
X
X
L
X
Z
Forced Power-Off
L
H
H
X
H
Normal Operation
with Forced Power-On
H
H
H
X
L
L
L
H
Yes
H
Normal Operation
with Auto Power-On
H
L
H
Yes
L
X
L
H
No
Z
Auto Power-Off
Note 2: H=high level, L=low level, X=irrelevant, Z=high impedance
Table 2. Each Receiver (Note 3)
INPUTS
OUTPUT
RECEIVER STATUS
RIN
FORCEON
FORCEOFF
______________________
ROUT
X
X
L
Z
Forced Power-Off
L
X
H
H
Normal Operation
H
X
H
L
Open
X
H
H
Table 3. ROUT2B and Outputs INVALID
________________
(Note 3)
INPUTS
OUTPUTS
OUTPUT STATUS
VALID RIN
RS-232 LEVEL
RIN2
FORCEON
FORCEOFF
______________________
INVALID
_________________
ROUT2B
Yes
L
X
X
H
L
Always Active
Yes
H
X
X
H
H
Yes
Open
X
X
H
L
No
Open
X
X
L
L
Note 3: H=high level, L=low level, X=irrelevant, Z=high impedance (off), Open=input disconnected
or connected driver off


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