UCC5621MWPTR

Overview

The UCC5621MWPTR is a 27-line active SCSI terminator manufactured by Texas Instruments in a QSOP-44 (MWP) package. It operates within a supply voltage range of 4V to 7V and provides 110 Ohm termination impedance trimmed to 5%. The device features split reverse disconnect logic, allowing independent control of lines 1–9 via DISCNCT2 and lines 10–27 via DISCNCT1. Electrical characteristics include a typical supply current of 2mA when terminated and 100µA in power-down mode. Output capabilities support -900mA sourcing for termination and +500mA sinking for active negation.

Feature Summary

• Compliant with SCSI, SCSI-2, SCSI-3, SPI, and FAST-20 standards
• Split reverse disconnect functionality for independent line control
• Low channel capacitance of 2.5pF during disconnect to preserve signal integrity
• Internal regulator output and thermal shutdown protection

Applications

• High-performance 5V SCSI systems requiring active termination
• Wide SCSI bus configurations utilizing the MWP package
• Hot-pluggable peripheral connections

Procurement Notes

Verify the specific ordering suffix 'PTR' against the manufacturer's official documentation to confirm reel packaging specifications. Ensure compatibility with the QSOP-44 footprint and validate that the component meets the required environmental operating temperatures before integration into final designs.

Selection Notes

Select this component for applications requiring precise 110 Ohm termination across 27 parallel lines. The split disconnect feature is critical for managing power consumption in lower-powered systems or controlling specific bus segments independently. Verify that the system design accommodates the 4V to 7V operating range and the associated heat dissipation requirements.

Part Context

This part belongs to the UCC5621 family of SCSI interface integrated circuits from Texas Instruments. It serves as a specialized solution for terminating wide SCSI buses, offering high performance and compliance with industry standards such as FAST-20. The MWP package variant provides a compact form factor suitable for dense circuit board layouts.

Replacement Considerations

Consult the manufacturer's datasheet for officially confirmed substitute part numbers. Verify pinout compatibility and electrical parameter alignment before considering alternative components.