1 Features

? Meets or exceeds ANSI standard EIA/TIA-422-B

? Operates from a single 5V power supply

? Drives loads as low as 50Ω up to 15Mbps

? TTL- and CMOS-input compatibility

? Output short-circuit protection

? Interchangeable with DS9638

2 Applications

? Factory automation

? ATM and cash counters

? Smart grid

? AC and servo motor drives

3 Description

The uA9638 is a dual high-speed differential line

driver designed to meet ANSI Standard EIA/TIA-422-

B. The inputs are TTL and CMOS compatible and

have input clamp diodes. Schottky-diode-clamped

transistors are used to minimize propagation delay

time. This device operates from a single 5V power

supply and is supplied in an 8-pin package.

The uA9638 provides the current needed to drive lowimpedance

loads at high speeds. Typically used with

twisted-pair cabling and differential receiver(s), baseband

data transmission can be accomplished up to

and exceeding 15Mbps in properly designed systems.

The uA9637A dual line receiver is commonly used as

the receiver. For even faster switching speeds in the

same pin configuration, see the SN75ALS191.

The uA9638 is characterized for operation from 0°C to

70°C.