DS8921M/NOPB

Overview

The DS8921M/NOPB is a differential line driver and receiver pair manufactured by Texas Instruments, housed in an SOIC-8 package. It operates on a single 5-V supply (4.5 V to 5.5 V) with a typical quiescent 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 provides complementary driver outputs and meets EIA RS-422 standards, including a ±7 V common-mode input range and 200 mV sensitivity.

Feature Summary

• Provides a complete differential driver and receiver pair within a single integrated circuit package.
• Features complementary driver outputs designed for low output skew and high-speed signal transmission.
• Supports wide common-mode voltage ranges of ±7 V with high input sensitivity for noisy environments.

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 'M' against the latest TI Package Option Addendum to confirm the active status and temperature rating. Ensure the ordering quantity matches the tube packaging specifications provided in the manufacturer's documentation. Cross-reference the datasheet revision date to validate all electrical parameters before finalizing procurement orders.

Selection Notes

Select this component when a combined driver and receiver solution is required for RS-422 or legacy disk drive standards. Verify that the commercial temperature range aligns with the system requirements. Consider the SOIC-8 footprint dimensions during PCB layout planning to ensure adequate clearance for the differential traces and termination resistors.

Part Context

This part belongs to the DS8921x family, which includes variants like the DS8921A and DS8921AT. These devices are specifically engineered for high-speed differential signaling in storage and industrial communication systems. The series maintains compatibility with TTL and CMOS logic levels while providing robust noise immunity over twisted-pair transmission lines.

Replacement Considerations

DS8921AM/NOPB

FAQ

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

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

Does the DS8921M/NOPB include a shutdown feature?

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

What is the typical hysteresis value of the receiver input?

The receiver input typically has a hysteresis of 70 mV to improve noise margin.