The DS9638 is a Schottky, TTL compatible, dual differential line driver designed
specifically to meet the EIA Standard RS-422 specifications. It is designed to provide unipolar
differential drive to twisted pair or parallel wire transmission lines. The inputs are TTL
compatible. The outputs are similar to totem pole TTL outputs, with active pull-up and pull-down.
The device features a short circuit protected active pull-up with low output impedance and is
specified to drive 50Ω transmission lines at high speed. The mini-CDIP provides high package
density.