Texas Instruments SN55113
The SN55113 and SN75113 dual differential line drivers with 3-state outputs are designed to provide all the features of the SN55114 and 1YS 1YP NC 1A 1B 3 2 1 20 19 4 18 5 17 6 16 7 15 8 14 9 10 11 12 13 2ZS 2YS NC 2YP 2A 1C GND NC CC 2C SN75114 line drivers with the added feature of driver output controls. This permits many devices to be connected together on the same transmission line for party-line applications. The output stages are similar to TTL totem-pole outputs, but with the sink outputs, YS and ZS, and the corresponding active pullup terminals, YP and ZP, available on adjacent package pins.