UCC5673PWP

Overview

The UCC5673PWP is a multi-mode SCSI terminator manufactured by Texas Instruments in a 28-pin TSSOP package. It supports operation within a TRMPWR voltage range of 2.7V to 5.25V and operates at temperatures from 0°C to +70°C. The device integrates both single-ended (SE) and low-voltage differential (LVD) termination networks, automatically selecting the appropriate mode based on the DIFSENS signal. Electrical specifications include a typical LVD supply current of 23mA and an SE supply current of 14mA. Differential impedance is typically 105Ω, while SE impedance ranges from 100Ω to 116Ω. Output capacitance is specified at 3pF.

Feature Summary

• Automatically selects between Single-Ended or Low Voltage Differential termination modes based on bus signals
• Integrates built-in SPI-3 mode change filter and delay circuitry for stable switching
• Provides differential failsafe biasing to maintain signal integrity during mode transitions
• Supports active negation and includes reversed disconnect polarity protection

Applications

• Multi-mode active termination for SCSI Parallel Interface (SPI-3) buses
• Termination for Ultra2 (SPI-2 LVD) and Ultra3/Ultra160 compliant systems
• Legacy SCSI-1 and SCSI-2 bus termination applications

Procurement Notes

Verify that the component matches the specific UCC5673PWP designation with the TSSOP-28 package configuration. Confirm compliance with RoHS standards as indicated in official documentation. Ensure the supplier provides traceability to Texas Instruments manufacturing records. Validate that the part number suffix corresponds strictly to the physical package type without implying functional variations unless explicitly documented by the manufacturer.

Selection Notes

Select this component when designing SCSI controllers requiring automatic adaptation to mixed SE and LVD devices on the same bus. The integrated mode selection eliminates the need for external logic to determine termination states. Consider the thermal requirements of the TSSOP package, utilizing the HS/GND pins for adequate heat dissipation during high-power SE operation. Verify that the system power supply remains within the 2.7V to 5.25V operating range for correct regulator performance.

Part Context

The UCC5673 belongs to the UCC567x family of multi-mode SCSI terminators designed for high-speed data transfer environments. It serves as a critical interface component ensuring signal integrity across varying SCSI generations. The PWP suffix identifies the 28-lead Thin Shrink Small Outline Package (TSSOP), which minimizes board footprint compared to larger packages like the MWP variant.

Replacement Considerations

Public confirmed substitute part numbers: UCC5673MWP.