HD26LS32

Rev.2.00, Jul.16.2004, page 12 of 14

2. Unidirectional Transmission (1 : n Configuration)

Driver

Data

input

Data

output

Data

output

Receiver

Data

output

Enable

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

Driver

Receiver

Data I/O

Enable

Driver

Receiver

Data I/O

Enable

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.