GENERAL DESCRIPTION
The ST34C87 is a CMOS quad differential line driver designed to meet the standard RS-422 requirements and digital data transmission over balanced lines. To improve noise margin and output stability for slow changing input signals, special hysteresis is built in the ST34C87 circuit. The ST34C87 is a high speed CMOS line driver designed to operate with MFM / RLL controllers and hard disk drives as well as RS-422 digital data transmission applications. ST34C87 is suitable for low power 5V operation with high input voltage protection devices.

FEATURES
 • Pin-to-Pin Compatible with National DS34C87
 • Low Power CMOS Design
 • Three-State Outputs with Enable Pin
 • Meets the EIA RS-422 Requirements
 • Low Propagation Delays
 • High Speed