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F81438 Datasheet(PDF) 7 Page - Feature Integration Technology Inc.

Part No. F81438
Description  Single 5V RS232/RS422/RS485 Multiprotocol
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Manufacturer  FINTEK [Feature Integration Technology Inc.]
Direct Link  http://www.fintek.com.tw/eng
Logo FINTEK - Feature Integration Technology Inc.

F81438 Datasheet(HTML) 7 Page - Feature Integration Technology Inc.

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F81438
Jan, 2012
V0.11P
7
5 Function Description
5.1
Mode Selection
The F81438 drivers and receivers can be configured to operate either as the standard RS-232 or
RS-485 / RS-422 devices. It can be reconfigured into four operating modes, and be selected by 2
configuration pins. The table below shows how to use the configuration pins to select the function
you want.
TABLE 1: Mode Select Configuration
Pin 2 Mode_1
Pin 23 Mode_2
Mode
Status
0
1
Pure RS-232
3T/ 5R RS-232.
1
0
RS-485 Receiver Half Duplex
1T/1R RS-485
1
1
RS-485 Driver Half Duplex
1T/1R RS-485
0
0
Pure RS-422 Full Duplex
1T/1R RS422 mode
The RS-485 / RS-422 drivers have the differential outputs and receivers have the differential
inputs. RS-232 drivers and receivers are single-ended with the inverting outputs. The following table
shows the characteristic of F81438 in RS-485 / RS-422 Full & Half Duplex mode.
TABLE 2: RS-232: MODE 01
DRIVERS
RECEIVERS
Input
Output
Input
Output
0
 
5V
 
3V
0
1
 
-5V
 
-3V
1
Open
 
-5V
Open
1
TABLE 3: RS-485 Driver & Receiver Half DUPLEX: MODE 10, MODE 11
TRANSMITTING
RECEIVING
Inputs
Outputs
Inputs
Outputs
DE/RE
TXIN
TX(A)
TX(B)
DE/RE
RX(A) - RX(B)
RXOUT
1
1
0
1
1
x
High-Z
1
0
1
0
1
x
High-Z
0
x
High-Z
High-Z
0
> -50mV
1
0
 
<-200mV
0
0
Open / Shorted
1


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