UCC5673MWP

Overview

The UCC5673MWP is a Multi-Mode Low Voltage Differential and Single Ended Terminator manufactured by Texas Instruments. It operates within a TRMPWR voltage range of 2.7V to 5.25V. The device integrates both SE and LVD termination networks into a single monolithic component, automatically selecting the appropriate mode based on the SCSI bus DIFSENS signal. Electrical characteristics include a differential impedance of 100Ω to 110Ω and an output capacitance of 3pF per line. It supports SCSI-1, SCSI-2, Ultra2 (SPI-2 LVD), and Ultra3/Ultra160 standards. The MWP package variant utilizes a 36-pin QSOP form factor.

Feature Summary

• Auto Selection Multi-Mode capability for Single Ended or Low Voltage Differential Termination
• Built-in SPI-3 Mode Change Filter and Delay mechanism
• Differential Failsafe Bias functionality
• Supports Active Negation

Applications

• Multi-mode active termination applications where single ended and low voltage differential devices coexist
• Terminating SCSI Parallel Interface (SPI-3) buses
• Compliant termination for Ultra2 and Ultra3 systems

Procurement Notes

Verify the specific package designation when ordering. The datasheet indicates that the UCC5673 is available in a 28-pin TSSOP package as well as the 36-pin MWP package. Ensure the selected part number matches the required footprint for your PCB layout. Confirm the latest revision status with the manufacturer before finalizing procurement plans.

Selection Notes

Select this component for designs requiring automatic switching between SE and LVD termination modes without external logic control. The device accommodates 3.3V systems with supply tolerance allowances. Consider thermal management requirements, as the device dissipates power proportional to the termination mode and supply voltage. Ensure proper grounding of HS/GND pins for adequate heat dissipation.

Part Context

The UCC5673 serves as a transition solution for SCSI Parallel Interface implementations moving toward higher speeds. It addresses the need for adequate skew budgets at reasonable costs through Low Voltage Differential signaling. The device simplifies board design by integrating multiple termination networks and control logic into one component, reducing the overall component count required for compliant bus termination.

Replacement Considerations

Public confirmed substitute part numbers are not available.