DS8921AMX/NOPB

Overview

The DS8921AMX/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 (4.5 V to 5.5 V) with a typical operating current of 35 mA. The device supports data rates up to 10 Mb/s and features a typical propagation delay of 12 ns with an output skew of 0.5 ns. It meets EIA RS-422 standards and provides complementary driver outputs. The receiver offers ±200 mV sensitivity over a ±7 V common-mode range with 70 mV hysteresis. It functions within an industrial temperature range of -40°C to +85°C.

Feature Summary

• Provides a complete differential driver and receiver pair for high-speed serial communication.
• Supports RS-422 signaling standards with robust noise immunity via input hysteresis.
• Features low output skew and fast propagation delays for precise timing control.
• Compatible with TTL and CMOS logic levels for direct interface integration.

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 'AMX' indicates the tape-and-reel packaging format containing 2500 units per reel. Confirm the 'NOPB' designation ensures compliance with RoHS directives and guarantees lead-free manufacturing processes. Ensure the component matches the industrial temperature rating (-40°C to +85°C) required for your operational environment before finalizing procurement orders.

Selection Notes

Select this component when a combined driver and receiver solution is needed for RS-422 or legacy disk drive protocols. It is suitable for designs requiring a single IC to handle both transmission and reception on twisted-pair lines. Consider the 8-pin SOIC footprint for space-constrained PCB layouts. Verify that the 5-V supply voltage aligns with the system's power distribution network.

Part Context

This part belongs to the DS8921x family, which includes variants like the DS8921A and DS8921AT. The 'AMX' suffix specifically denotes the surface-mount SOIC package with tape-and-reel shipping. Other suffixes may indicate different packaging types such as tubes or different temperature grades within the same functional family.

Replacement Considerations

DS8921AM/NOPB: Identical electrical specifications but packaged in tubes instead of tape-and-reel.

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 DS8921AMX/NOPB include a shutdown pin?

No, the device does not feature a shutdown pin; it operates continuously when powered.

What is the typical input hysteresis value for the receiver?

The receiver incorporates typical input hysteresis of 70 mV to improve noise margins.