DS8921MX

Overview

The DS8921MX/NOPB is a differential line driver and receiver pair manufactured by Texas Instruments, housed in an SOIC-8 package. It operates on a supply voltage ranging from 4.5 V to 5.5 V with a typical operating current of 35 mA. The device features a typical propagation delay of 12 ns and output skew of 0.5 ns. It supports a common-mode input voltage range of ±7 V and offers receiver sensitivity of ±200 mV with typical hysteresis of 70 mV. The component is rated for commercial operation between 0°C and +70°C.

Feature Summary

• Provides complementary driver outputs with low output skew for precise timing applications
• Supports high differential or common-mode input voltage ranges up to ±7 V
• Incorporates receiver input hysteresis to improve noise margin 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 against official documentation to confirm temperature rating and packaging type. Confirm that the 'MX' designation corresponds to the SOIC-8 tape and reel format as specified in the manufacturer's orderable addendum. Ensure compatibility with the required PCB footprint and soldering profile before finalizing procurement.

Selection Notes

Select this component when designing systems requiring RS-422 compliance or legacy disk drive standards like ST506 and ESDI. Verify that the commercial temperature range (0°C to +70°C) meets the environmental requirements of the target application. Consider the DS8921AT variant if industrial temperature operation (-40°C to +85°C) is necessary instead.

Part Context

This part belongs to the DS8921x family of differential line drivers and receivers designed specifically for disk drive and serial communication standards. The MX suffix indicates the SOIC-8 surface-mount package configuration. It serves as a core interface solution for translating TTL/CMOS logic levels to differential signaling over twisted-pair or parallel wire transmission lines.

Replacement Considerations

DS8921M/NOPB (Tube Packaging)

FAQ

What is the maximum common-mode input voltage supported by the receiver?

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

Does the DS8921 include a shutdown feature?

No, the DS8921 does not have a shutdown pin; it lacks a shutdown function.

What is the typical receiver input hysteresis value?

The typical receiver input hysteresis is 70 mV.