UCC5672PWPTRG4

Overview

The UCC5672PWPTRG4 is a multi-mode SCSI terminator manufactured by Texas Instruments, designed for single-ended (SE) and low voltage differential (LVD) termination. It operates within a supply voltage range of 2.7V to 5.25V and supports SCSI-1, SCSI-2, Ultra2 (SPI-2 LVD), Ultra3/Ultra160 (SPI-3), and Ultra320 (SPI-4) standards. The device features automatic mode selection based on the DIFSENS signal, providing 105Ω differential impedance in LVD mode and 108Ω typical impedance in SE mode. It includes built-in SPI-3 mode change filters with delays up to 300ms and differential failsafe biasing. Packaged in a 28-pin TSSOP, it dissipates up to 130mW per active line at maximum voltage.

Feature Summary

• Automatically selects between Single Ended and Low Voltage Differential termination modes based on bus signals
• Integrates both SE and LVD termination networks into a single monolithic component
• Includes built-in noise filtering and delay mechanisms to prevent false mode switching
• Supports Active Negation and provides differential failsafe biasing

Applications

• Termination for SCSI Parallel Interface (SPI-3) compliant systems
• Multi-mode active termination where SE and LVD devices coexist on the same bus
• High-speed data storage interfaces requiring Ultra2 or Ultra3 compliance

Procurement Notes

Verify that the ordering suffix 'TRG4' aligns with specific manufacturing lot requirements or environmental compliance standards defined by Texas Instruments. Confirm package availability as the standard tube packaging may differ from tape-and-reel configurations. Ensure compatibility with existing board layouts utilizing the 28-pin TSSOP footprint before finalizing procurement orders.

Selection Notes

Select this component when designing SCSI buses that require seamless transition between high-voltage differential, single-ended, and low-voltage differential modes. Ensure the design accommodates the required 4.7µF bypass capacitors on the REG and TRMPWR pins. Verify that the PCB layout meets the strict capacitance balance requirements specified in the SPI-2 standard to maintain signal integrity.

Part Context

This part belongs to the UCC5672 family of multi-mode terminators. It serves as a critical interface component for legacy and modern SCSI architectures, bridging the gap between older single-ended technologies and newer low-voltage differential standards. The device simplifies system design by eliminating the need for separate termination networks for different SCSI generations.

Replacement Considerations

The UCC5672MWP is available in a 36-pin MWP package offering equivalent functionality. Designers must account for pinout differences and thermal management requirements when substituting packages. No direct cross-model replacements are documented; verify electrical compatibility if considering alternative manufacturers.