DS8922AN/NOPB

Overview

The DS8922AN/NOPB is a dual differential line driver and receiver pair designed for RS-422 applications. It operates within a supply voltage range of 4.5 V to 5.5 V, with a typical operating current of 76 mA in active mode. The device features a typical propagation delay of 12 ns and an output skew of ±0.5 ns. It supports complementary driver outputs and includes tri-state functionality controlled by independent enable inputs. The receiver provides high input sensitivity of 200 mV over a common-mode voltage range of ±7 V, incorporating 70 mV hysteresis and fail-safe circuitry.

Feature Summary

• Dual differential line driver and receiver pairs optimized for RS-422 standards
• Tri-state outputs with independent control functions for drivers and receivers
• High noise immunity via 70 mV receiver input hysteresis and fail-safe logic
• Glitch-free power-up/down circuitry prevents erroneous transmission line states

Applications

• ST506 disk drive interface systems
• ST412 disk drive interface systems
• ESDI (Enhanced Small Device Interface) connections

Procurement Notes

Verify the specific ordering suffix against the manufacturer's official documentation to confirm package type and temperature rating. Confirm RoHS compliance status and lifecycle stage, as availability may be restricted based on production discontinuation notices. Ensure the component matches the required pinout and electrical specifications for the target design before finalizing procurement orders.

Selection Notes

Select this component when designing interfaces requiring dual differential signaling compliant with RS-422 standards. It is suitable for legacy storage protocols like ST506 and ESDI where low propagation delay and precise channel-to-channel skew are critical. Verify that the system operates within the specified 0°C to 70°C temperature range and utilizes a 5 V supply rail.

Part Context

This part belongs to the DS8922/DS8923A family of RS-422 transceivers manufactured by Texas Instruments. It serves as a dual-pair solution, contrasting with single-pair variants or higher-speed LVDS alternatives. The device is specifically engineered for parallel wire and twisted pair transmission lines used in older computer storage architectures.

Replacement Considerations

The DS8922AM/NOPB is a documented variant within the same product family, offering identical electrical characteristics but packaged in SOIC format instead of PDIP.