1FEATURES

2• Meets or Exceeds ANSI Standard

EIA/TIA-422-B

• Operates From a Single 5-V Power Supply

• Drives Loads as Low as 50 Ω up to 15 Mbps

• TTL- and CMOS-Input Compatibility

• Output Short-Circuit Protection

• Interchangeable With National

Semiconductor™ DS9638

SUPPORTS DEFENSE, AEROSPACE,

AND MEDICAL APPLICATIONS

• Controlled Baseline

• One Assembly/Test Site

• One Fabrication Site

• Rated From –40°C to 85°C

• Extended Product Life Cycle

• Extended Product-Change Notification

• Product Traceability

DESCRIPTION

The uA9638C 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 5-V power supply and is supplied in

an 8-pin package.

The uA9638 provides the current needed to drive low-impedance loads at high speeds. Typically used with

twisted-pair cabling and differential receiver(s), base-band data transmission can be accomplished up to and

exceeding 15 Mbps 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 uA9638C is characterized for operation from -40°C to 85°C.