UCC561DPTR

Overview

The UCC561DPTR is a low-voltage differential SCSI (LVD) 27-line regulator set manufactured by Texas Instruments. It provides precise reference voltages and bias currents for LVD termination resistor networks, supporting SPI-2, SPI-3, and SPI-4 standards. The device integrates two sink/source regulators and a buffered output in a 16-pin SOIC package. Operating from a 2.7-V to 5.25-V supply, it delivers regulated outputs of 1.75 V, 1.3 V, and 0.75 V with internal current limiting and thermal shutdown protection.

Feature Summary

• Integrates dual source/sink regulators and a buffered output for LVD SCSI termination
• Provides differential failsafe bias and meets common mode impedance requirements
• Includes thermal shutdown and active current-limiting circuitry

Applications

• Servers
• Workstations
• RAID Boxes

Procurement Notes

Verify the specific ordering suffix against the manufacturer's documentation to confirm temperature range and transport media specifications. Confirm that the component matches the required SPI-2 through SPI-4 interface standards. Ensure proper ESD handling precautions are observed during installation to prevent damage to the precision integrated circuit.

Selection Notes

Select this component for designs requiring compliant LVD termination networks for Ultra2, Ultra3, or Ultra320 interfaces. Verify that the system operates within the 2.7-V to 5.25-V voltage range. Note that the device is not intended for SPI-5 applications. Ensure adequate decoupling capacitors are used on the supply pin for optimal performance.

Part Context

This part belongs to the UCC561 series of low-voltage differential SCSI regulator sets. It is designed specifically to replace discrete resistor stacks with an integrated solution that simplifies board layout while maintaining signal integrity compliance for high-speed parallel SCSI interfaces.

Replacement Considerations

No public confirmed substitute part numbers are available.