UCC561DP

Overview

The UCC561DP is a low-voltage differential (LVD) regulator set designed for SCSI and SPI-2 through SPI-4 applications. It integrates three regulated outputs: a 1.75-V source/sink regulator, a 0.75-V source/sink regulator, and a 1.3-V buffered output for differential sense signaling. The device operates on a single supply voltage ranging from 2.7 V to 5.25 V. It incorporates thermal shutdown and active current-limiting circuitry to protect against overloads. The component is housed in a 16-pin SOIC (DP) package and supports an operating temperature range of 0°C to 70°C.

Feature Summary

• Integrates dual sink/source reference voltage regulators with a buffered 1.3-V output
• Provides correct references and bias currents for LVD termination resistor networks
• Includes protection features such as thermal shutdown and active current limiting

Applications

• Servers
• Workstations
• RAID Boxes

Procurement Notes

Verify the specific ordering number UCC561DP matches the required 16-pin SOIC package and 0°C to 70°C temperature range. Confirm that the application strictly adheres to SPI-2, SPI-3, or SPI-4 standards, as the device is not intended for SPI-5 implementations. Ensure proper decoupling capacitors are utilized during integration.

Selection Notes

Select this component when designing LVD SCSI or Ultra2/Ultra3/Ultra320 interfaces requiring integrated termination regulation. It eliminates the need for discrete resistor stacks by providing precise 1.75-V, 0.75-V, and 1.3-V rails. Verify that the system power supply remains within the 2.7-V to 5.25-V operational limits to ensure stable regulator performance.

Part Context

The UCC561 is part of Texas Instruments' portfolio of interface and driver solutions for high-speed data transmission. It specifically addresses the power management requirements for Low-Voltage Differential signaling standards. The DP suffix denotes the 16-pin Small Outline Integrated Circuit package used for surface-mount assembly.

Replacement Considerations

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

FAQ

Is the UCC561 suitable for SPI-5 applications?

No, the UCC561 is explicitly not intended for SPI-5 applications. It is designed for SPI-2, SPI-3, and SPI-4 standards.

What protection features are included in the UCC561?

The device includes thermal shutdown and active current-limiting circuitry to prevent damage during overload conditions.

What is the recommended decoupling capacitor value for the TERMPWR pin?

A minimum of a 2.2-µF low-ESR capacitor is required, with a 4.7-µF low-ESR capacitor recommended for best performance.