UCC5619MWP

Overview

The UCC5619MWP is a 27-line active terminator designed for SCSI parallel buses. It operates within a 4V to 7V supply range and provides 110Ω termination impedance trimmed to 5%. The device features a low channel capacitance of 2.5pF during disconnect mode, which preserves signal integrity at interim bus points. Supply current drops to 100µA in power-down mode when the DISCNCT pin is low. The output stage sources up to -900mA for termination and sinks +500mA for active negation. It includes an internal 2.7V regulator and offers thermal shutdown and current limit protection.

Feature Summary

• Complies with SCSI, SCSI-2, SCSI-3, SPI, and FAST-20 standards
• Logic command disconnects all termination lines for hot plugging
• Internal circuit trimming ensures precise 110Ω impedance matching
• Includes thermal shutdown and current limit protection

Applications

• High performance 5V SCSI systems
• Lower powered systems requiring low standby current
• SCSI bus configurations requiring active termination at both cable ends

Procurement Notes

Verify the specific ordering suffix against the manufacturer's latest documentation to confirm package type and lead finish. Ensure the component status is listed as Active for new designs. Cross-reference the datasheet revision date to validate electrical characteristics and absolute maximum ratings before finalizing procurement specifications.

Selection Notes

Select this component for applications requiring compliance with SCSI-3 and FAST-20 standards. The low channel capacitance makes it suitable for maintaining signal integrity on long or multi-drop buses. Verify that the system voltage falls within the 4V to 7V operating range and that the thermal environment does not exceed the junction temperature limits without adequate heatsinking.

Part Context

This device belongs to the Unitrode terminator family, known for high-performance SCSI applications. It utilizes industry-standard 36-pin wide body QSSOP packaging. The design incorporates internal trimming to maximize noise margins in fast SCSI operations, distinguishing it from passive termination solutions by providing active negation capabilities.

Replacement Considerations

Consult the manufacturer's official substitution guide for verified alternatives. Generic SCSI terminators may lack the specific 2.5pF channel capacitance or active negation current requirements necessary for full SCSI-3 compliance.