DS8921N

Overview

The DS8921N/NOPB is a differential line driver and receiver pair manufactured by Texas Instruments. It operates on a single 5-V supply with a voltage range of 4.5 V to 5.5 V. The device features one driver and one receiver, supporting data rates up to 10 Mb/s. It utilizes an 8-pin PDIP package for through-hole mounting. The component functions within a commercial temperature range of 0°C to 70°C and draws a maximum operating supply current of 35 mA.

Feature Summary

• Provides complementary differential outputs for driving twisted-pair or parallel wire transmission lines.
• Features high common-mode input voltage ranges of ±7 V with 200 mV sensitivity.
• Incorporates receiver input hysteresis to improve noise margins for slowly changing waveforms.

Applications

• ST506 disk drive standard interfaces
• ST412 disk drive standard interfaces
• ESDI disk drive standard interfaces
• RS-422 interface applications

Procurement Notes

Verify the specific ordering suffix to confirm the package type and temperature rating. Confirm RoHS compliance status and lead finish details in the latest datasheet addendum. Check for lifetime buy announcements as availability may be restricted for older components.

Selection Notes

Select this component when a single-package solution for both differential signaling and reception is required. Ensure the application environment remains within the 0°C to 70°C commercial temperature limits. Verify that the PCB layout supports through-hole mounting requirements for the PDIP package.

Part Context

This part belongs to the DS8921 family, which includes variants like the DS8921A and DS8921AT. These devices are designed specifically for legacy disk drive standards and RS-422 communication links. The family provides low skew and fast propagation delays suitable for high-speed data transmission.

Replacement Considerations

DS8921AM/NOPB (SOIC-8 Package)

FAQ

What is the typical propagation delay for the DS8921?

The typical propagation delay is 12 ns.

Does the DS8921 support shutdown modes?

No, the DS8921 does not include a shutdown feature.

What is the receiver input hysteresis value?

The receiver input hysteresis is typically 70 mV.