HD26LS32 Datasheet, PDF (13/15 Pages) Hitachi Semiconductor – Quadruple Differential Line Receivers With 3 State Outputs

2. Unidirectional Transmission (1 : n Configuration)
Driver
Data
input
R_T
R_T
Receiver
HD26LS32
Data
output
Enable
Data
output
Data
output
Data
output
Figure 10 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
Data I/O
Enable
Driver
R_T
Receiver
R_T
Data I/O
Enable
Receiver
Driver
Figure 11 Bidirectional Transmission
When bidirectional data exchange is performed using a combination of the HD26LS31 and HD26LS32,
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 11 .
Extending this combination makes it possible to exchange n-bit data simultaneously, and handle a party
line system.
13