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XR32431EUCR-F Datasheet(PDF) 11 Page - Exar Corporation

Part # XR32431EUCR-F
Description  3-Driver/5-Receiver Intelligent RS-232 Transceiver with 1.65V-5.5V Interface
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Manufacturer  EXAR [Exar Corporation]
Direct Link  http://www.exar.com
Logo EXAR - Exar Corporation

XR32431EUCR-F Datasheet(HTML) 11 Page - Exar Corporation

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© 2014 Exar Corporation
XR32430/XR32431
11 / 13
exar.com/XR32430_XR32431
Rev 1A
When the XR32430/31 is shut down, the charge pumps are turned off. V+ charge pump output decays to VCC, the V- output
decays to GND. The decay time will depend on the size of capacitors used for the charge pump. Once in shutdown, the time
required to exit the shut down state and have valid V+ and V- levels is typically 30μs.
For easy programming, the STATUS can be used to indicate DSR or a Ring Indicator signal. Tying ONLINE and SHUT-
DOWN together will bypass the AUTO ON-LINE® circuitry so this connection acts like a shutdown input pin.
Table 2: XR32430/31 Operation Truth Table
Valid
RS-232
Level at
Receiver
Input
Shutdown
OnLine
Driver
Outputs
Receiver
Outputs
Status
Mode of Operation
Yes
L
x
High-Z
High-Z
H
Manually forced shutdown
No
L
x
High-Z
High-Z
L
Manually forced shutdown
Yes
H
L
Active
Active
H
Normal Operation
(Auto On-Line® enabled)
No
H
L
High-Z
Active
L
Standby Operation due to
Auto On-Line® circuitry
Yes
H
H
Active
Active
H
Normal Operation
No
H
H
Active
Active
L
Normal Operation
Table 3: XR32430/31 Driver and Receiver Truth Table
Shutdown
RxIN
RxOUT
TxIN
TxOUT
L
x
High-Z
x
High-Z
HLHLH
HH
L
H
L


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