UCC5672PWPTR

Overview

The UCC5672PWPTR is a multi-mode SCSI terminator in a 28-pin TSSOP package. It supports 2.7V to 5.25V operation and automatically selects between Single-Ended (SE) and Low Voltage Differential (LVD) termination based on the DIFSENS signal. The device integrates nine termination lines compliant with SCSI-1, SCSI-2, Ultra2, Ultra3/Ultra160, and Ultra320 standards. Electrical characteristics include a differential impedance of 105 Ohms typical, supply currents of 23 mA for LVD mode and 14 mA for SE mode, and an output capacitance of 3 pF per line.

Feature Summary

• Auto-selection mechanism switches between Single-Ended and Low Voltage Differential modes based on bus signals
• Integrates built-in SPI-3 mode change filter and delay circuitry
• Provides differential failsafe bias for reliable signal integrity
• Supports active negation functionality

Applications

• Termination for SCSI Parallel Interface (SPI-3) buses
• Multi-mode termination for systems coexisting with SE and LVD devices
• Compliant termination for Ultra2, Ultra3/Ultra160, and Ultra320 standards

Procurement Notes

Verify component status as the UCC5672PWPTR is listed as obsolete in official documentation. Confirm availability through authorized distributors or secondary markets. Ensure compatibility with existing board layouts designed for the 28-pin TSSOP package. Review lead finish specifications and moisture sensitivity levels prior to procurement.

Selection Notes

Select this component for applications requiring automatic transition between SE and LVD SCSI termination modes. Verify that the system operates within the 2.7V to 5.25V voltage range. Ensure PCB layout accommodates the required heat sink ground connections for thermal management. Confirm that the 28-pin TSSOP package fits the designated footprint constraints.

Part Context

The UCC5672 is part of Texas Instruments' SCSI interface integrated circuit family. It is designed to replace discrete termination networks by integrating both SE and LVD termination into a single monolithic component. The device simplifies design for high-speed SCSI buses by handling mode detection and switching internally.

Replacement Considerations

The UCC5672PWP is the tube-packaged equivalent of this component. Both share identical electrical specifications and pinouts. Verify if the tube packaging meets storage and handling requirements for the specific manufacturing process.