DS8921MX/NOPB

Overview

The DS8921MX/NOPB is a differential line driver and receiver pair manufactured by Texas Instruments, housed in an 8-pin SOIC package. It operates on a single 5-V supply with a voltage range of 4.5 V to 5.5 V. The device features a typical propagation delay of 12 ns and an output skew of 0.5 ns. It supports a common-mode input voltage range of ±7 V with a receiver sensitivity of ±200 mV. The component includes 70 mV typical hysteresis for noise immunity and meets EIA RS-422 standards.

Feature Summary

• Provides complementary differential outputs for driving twisted-pair or parallel wire transmission lines.
• Features high common-mode input voltage tolerance 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 suffix 'MX' indicates tape-and-reel packaging when ordering. Confirm the temperature grade matches system requirements, as the base model differs from industrial variants. Ensure the NOPB designation confirms lead-free and RoHS compliance status before finalizing procurement documentation.

Selection Notes

Select this component for applications requiring low propagation delay and tight output skew. Verify that the required operating temperature falls within the commercial range of 0°C to 70°C. If extended temperature operation is necessary, consider the DS8921AT variant instead. Ensure the power supply remains stable between 4.5 V and 5.5 V.

Part Context

This part belongs to the DS8921 family of differential transceivers designed for legacy disk drive standards. It serves as a bridge between TTL/CMOS logic and differential signaling environments. The MX suffix specifically denotes the surface-mount SOIC package configuration available in reel formats.

Replacement Considerations

DS8921AM/NOPB

FAQ

What is the maximum common-mode input voltage supported?

The receiver supports a common-mode input voltage range of ±7 V.

Does the device include input hysteresis?

Yes, the receiver incorporates typical hysteresis of 70 mV to enhance noise margin.

What is the typical output skew value?

The typical output skew is 0.5 ns.