DS8921AN

Overview

The DS8921AN is a differential line driver and receiver pair integrated circuit 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 2 Mbps. Typical propagation delay is 12 ns with an output skew of 0.5 ns. It provides complementary driver outputs and supports high differential or common-mode input voltage ranges of ±7 V. The receiver includes hysteresis of approximately 70 mV for improved noise margin. Operating temperature range is 0°C to 70°C.

Feature Summary

• Designed specifically for ST506, ST412, and ESDI disk drive standards as well as RS-422 interface applications.
• Provides TTL/CMOS compatible inputs and outputs for seamless integration with standard logic families.
• Features complementary driver outputs that ensure low output skew for precise timing in high-speed interconnects.

Applications

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

Procurement Notes

Verify the specific package type (SOIC or PDIP) and suffix requirements against the manufacturer's current orderable addendum. Confirm the operating temperature range matches the application needs, as variants exist for commercial and industrial temperatures. Ensure compliance with RoHS directives if required by the design specifications.

Selection Notes

Select this component for applications requiring a compact differential transceiver solution compatible with legacy disk drive interfaces. Consider the 0°C to 70°C commercial temperature rating when evaluating environmental constraints. Verify that the transmission line impedance and termination requirements align with the device's electrical characteristics for optimal signal integrity.

Part Context

The DS8921AN belongs to the DS8921x family, which includes the DS8921, DS8921A, and DS8921AT. These devices share identical functional characteristics but differ in packaging options and temperature ratings. The 'N' suffix typically denotes a PDIP package variant within this series.

Replacement Considerations

Direct replacements include other members of the DS8921x family such as the DS8921AM or DS8921AT, depending on the required package style and temperature range. Cross-reference the pinout and electrical specifications to ensure compatibility with existing designs.