UCC5629FQPTR

Overview

The UCC5629FQPTR is a multimode SCSI terminator in a 48-pin LQFP package. It operates from 2.7 V to 5.25 V and automatically detects the bus type via the DIFFB pin, switching between single-ended (SE) and low-voltage differential (LVD) termination. The device supports SCSI-1 through Ultra320 standards. Electrical characteristics include a differential impedance of 100 Ω to 110 Ω and an SE impedance of 102.3 Ω to 117.7 Ω. Supply current ranges from 1.6 mA to 25 mA depending on the mode.

Feature Summary

• Automatically senses the bus state and switches termination between single-ended and low-voltage differential modes.
• Provides thermal packaging with heatsink ground pins to reduce junction temperature and improve reliability.
• Includes differential failsafe biasing to ensure signal integrity during detection or disconnect states.

Applications

• Termination for SCSI-1, SCSI-2, and SCSI-3 parallel interfaces
• Termination for Ultra (Fast-20), Ultra2 (SPI-2 LVD), Ultra3, Ultra160 (SPI-3), and Ultra320 (SPI-4) architectures

Procurement Notes

Verify the component matches the specific Texas Instruments datasheet SLUS444A. Confirm the 48-pin LQFP package and TR suffix indicate tape-and-reel packaging. Ensure the operating temperature range aligns with system requirements.

Selection Notes

Select this device for systems requiring automatic transition between SE and LVD SCSI buses. Ensure the PCB layout maintains 120-ohm differential impedance and capacitance balance. Verify that the supply voltage remains within the 2.7-V to 5.25-V recommended operating conditions.

Part Context

This part belongs to the UCC5629 family of multimode SCSI terminators. The FQP suffix denotes the 48-pin LQFP package variant. The TR suffix indicates the device is supplied in a tape-and-reel format suitable for automated assembly processes.

Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation.