HD26C32A Datasheet, PDF (12/14 Pages) Hitachi Semiconductor – Quadruple Differential Line Receivers With 3 State Outputs

HD26C32A
2. Unidirectional Transmission (1 : n Configuration)
Driver
Receiver
Data
Input
R_T
R_T
Data
Output
Enable
Receiver
Data
Output
Data
Output
Data
Output
Figure 7 1:n Unidirectional Transmission
With this connection method, n receivers are connected for one driver. In the RS-422A standard, ten
receivers can be connected simultaneously for one driver.
Conversely, it is also possible to connect one receiver for n drivers.
3. Bidirectional Transmission
Driver
Data
Input/
R_T
Output
Receiver
Data
R_T
Input/
Output
Enable
Enable
Receiver
Driver
Figure 8 Bidirectional Transmission
When bidirectional data exchange is performed using a combination of the HD26C31 and HD26C32A,
since either high or low output control is possible, using complementary enable inputs for the driver and
receiver makes it easy to configure the kind of combination illustrated in figure 8.
Extending this combination makes it possible to exchange n-bit data simultaneously, and handle a party
line system.
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