DS8921M

Overview

The DS8921M is a single RS-422 differential line driver and receiver pair integrated circuit manufactured by Texas Instruments, formerly National Semiconductor. It operates within a supply voltage range of 4.5 V to 5.5 V, with a typical operating voltage of 5 V. The device draws a maximum quiescent current of 35 mA and dissipates up to 730 mW of power. Designed for surface-mount applications, it is housed in an SOIC-8 package. The component supports an extended industrial temperature range from -40°C to +85°C, ensuring reliable performance in demanding environments.

Feature Summary

• Provides a complete differential transmission solution with one driver and one receiver in a compact package.
• Features low skew characteristics suitable for high-speed data communication systems.
• Designed for robust operation across wide industrial temperature ranges.

Applications

• High-speed serial communication interfaces requiring RS-422 compliance.
• Industrial control systems and automation networks.
• Data acquisition systems utilizing differential signaling for noise immunity.

Procurement Notes

Verify the manufacturer designation carefully, as National Semiconductor was acquired by Texas Instruments. Ensure the specific suffix matches the required package type and temperature grade. Confirm RoHS compliance status through official documentation before integration into regulated assemblies.

Selection Notes

Select this component when a single differential channel is required for RS-422 applications. Compare against the DS8921A variant for potential updates in electrical specifications or packaging options. Verify that the SOIC-8 footprint aligns with the target PCB layout constraints.

Part Context

This part belongs to the DS8921x family of high-speed, low-skew RS-422 transceivers. Originally developed by National Semiconductor, production and support were transferred to Texas Instruments following their acquisition. The series is designed to solve critical system timing problems in high-speed data links.

Replacement Considerations

The DS8921A is a documented variant within the same product family. Verify pin compatibility and electrical parameter overlaps before substitution. Other RS-422 transceivers may require significant circuit redesign due to differing pinouts or drive strengths.