DS8921N/NOPB

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 provides a typical propagation delay of 12 ns and an output skew of 0.5 ns. The receiver input sensitivity is ±200 mV over a common-mode range of ±7 V. Operating temperature ranges from 0°C to 70°C. It is housed in an 8-pin PDIP package.

Feature Summary

• Designed for ST506, ST412, and ESDI disk drive standards
• Meets EIA RS-422 signaling requirements
• TTL and CMOS compatible inputs and outputs

Applications

• ST506 Disk Drive Standard
• ST412 Disk Drive Standard
• ESDI Disk Drive Standard
• RS-422 Interface

Procurement Notes

Verify the LIFEBUY status before finalizing designs. Confirm that the PDIP-8 package meets mechanical constraints. Ensure the commercial temperature range aligns with system requirements. Check for updated documentation regarding end-of-life procedures.

Selection Notes

Select this component for legacy disk drive interfaces requiring RS-422 compliance. Verify compatibility with TTL or CMOS logic levels. Consider the 0°C to 70°C operating range. Evaluate the 8-pin PDIP footprint against PCB layout constraints.

Part Context

Part of the DS8921x family including DS8921A and DS8921AT variants. Shares identical electrical specifications but differs in package type and temperature rating. The N suffix indicates the PDIP package option within the series.

Replacement Considerations

DS8921AM/NOPB (SOIC package)

FAQ

What is the maximum common-mode input voltage?

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

Does the device include a shutdown function?

No, the DS8921 does not have a shutdown pin or feature.

What is the typical receiver input hysteresis?

The typical receiver input hysteresis is 70 mV.