DS8922MX

Overview

The DS8922MX is a dual differential line driver and receiver pair manufactured by Texas Instruments, housed in a 16-SOIC package. It operates within a supply voltage range of 4.5V to 5.5V and supports an operating temperature range of 0°C to 70°C. The device features a typical propagation delay of 12 ns with a channel-to-channel output skew of ±0.5 ns. Receiver input hysteresis is typically 70 mV, providing enhanced noise immunity for slowly changing waveforms. The components are designed to meet EIA RS-422 standards as well as ST506, ST412, and ESDI disk drive specifications.

Feature Summary

• Complementary driver outputs provide low signal skew and high-speed performance suitable for demanding interface applications.
• Receiver inputs incorporate fail-safe circuitry that defaults to a logical one state when inputs are left open.
• Integrated power-up/down logic ensures glitch-free operation by tri-stating outputs during system power transitions.

Applications

• ESDI (Enhanced Small Device Interface) disk drive systems
• ST506 and ST412 storage interface connections
• RS-422 compliant data transmission lines

Procurement Notes

Verify component authenticity through authorized channels due to the device's discontinued status. Confirm the specific suffix matches the required packaging format. Ensure the revision level aligns with existing design documentation. Check for lead-free compliance if required by current manufacturing standards. Validate pinout compatibility before integrating into new hardware layouts.

Selection Notes

Select this component for designs requiring robust differential signaling over twisted pair or parallel wires. The device is compatible with standard TTL and CMOS logic levels. Consider the 16-SOIC footprint constraints during PCB layout. Evaluate thermal dissipation requirements based on the maximum package power dissipation limits provided in the datasheet.

Part Context

This part belongs to the DS8922/DS8922A/DS8923A family of TRI-STATE RS-422 transceivers. While functionally similar to the DS8922A, the MX suffix specifically denotes the surface-mount SOIC package variant. The family shares core electrical characteristics but differs in control pin configurations between the 22 and 23 series models.

Replacement Considerations

The DS8922AMX/NOPB is a verified lead-free replacement option within the same product family. Verify that the NOPB suffix does not alter the functional pinout or electrical parameters relative to the original specification.