UCC5622MWPTR

Overview

The UCC5622MWPTR is a 27-line active SCSI terminator designed for high-performance 5V systems. It operates within a 4V to 7V supply range and provides 110-ohm termination impedance trimmed to 5% accuracy. The device features split disconnect control, allowing independent management of lines 1–9 via DISCNCT2 and lines 10–27 via DISCNCT1. In disconnect mode, the supply current drops to approximately 100µA. Key electrical characteristics include a maximum sourcing current of -900mA for termination and a sinking current capability of +500mA for active negation. The component utilizes a QSOP-44 package.

Feature Summary

• Compliant with SCSI, SCSI-2, SCSI-3, SPI, and FAST-20 standards
• Low channel capacitance of 2.5pF during disconnect to preserve signal integrity
• Integrated thermal shutdown and current limit protection
• Hot-pluggable operation with high impedance appearance when powered down

Applications

• Termination for wide SCSI parallel buses
• High-performance 5V SCSI system designs
• Systems requiring split termination control for data bytes and control bits

Procurement Notes

Verify the specific ordering suffix against the manufacturer's latest documentation to confirm package type and reel specifications. Confirm that the procurement source provides valid traceability for the RoHS-compliant Green classification. Ensure the component status is checked as ACTIVE for new designs, noting that obsolete variants exist in the family.

Selection Notes

Select this component for applications requiring precise 110-ohm termination on 27-line SCSI interfaces. The split disconnect feature is critical for managing power consumption in systems where only portions of the bus require termination. Verify that the operating temperature range of 0°C to 70°C aligns with the environmental requirements of the target application.

Part Context

This device belongs to the Unitrode terminator family, now part of Texas Instruments' portfolio. It is specifically engineered to meet the rigorous noise margin requirements of FAST-20 (Ultra) SCSI operations. The internal circuit trimming ensures output current matches SCSI-3 specifications closely, distinguishing it from standard passive terminators.

Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation.