UCC5680PW28

Overview

The UCC5680PW28 is a low-voltage differential (LVD) Small Computer System Interface (SCSI) terminator in a 28-pin TSSOP package. It operates within a supply voltage range of 2.7 V to 5.25 V and supports an operating temperature range of 0°C to 70°C. The device provides a typical differential impedance of 105 Ω and common-mode impedance of 150 Ω, with a differential bias voltage of 125 mV. It includes a built-in mode change delay filter ranging from 100 ms to 300 ms for SPI-3 compliance. Thermal shutdown activates at approximately 140°C to 170°C.

Feature Summary

• Integrates a mode change delay function required by the SPI-3 specification.
• Senses SCSI driver types via the DIFFSENS line and disconnects if SE or HVD drivers are detected.
• Biases bus lines to a failsafe state to ensure signal integrity.
• Includes thermal shutdown protection to prevent damage during overheating.

Applications

• Terminating LVD-only SCSI buses.
• SPI-3 compliant system implementations.
• Ultra2, Ultra3/Ultra160, and Ultra320 SCSI interfaces.

Procurement Notes

Verify the specific ordering suffix against the manufacturer's current documentation to confirm package type and reel quantity. Confirm that the component status remains active for new designs. Ensure environmental classifications match project requirements before finalizing procurement orders.

Selection Notes

Select this component for systems requiring LVD termination only. Verify that the design does not require support for single-ended or high-voltage differential drivers. Ensure the PCB layout accommodates the 28-pin TSSOP footprint and meets capacitance limits specified for Ultra320 standards.

Part Context

This device belongs to the UCC5680 family of SCSI terminators. It is available in both 24-pin and 28-pin TSSOP packages. The 28-pin variant includes an additional LVD status output pin compared to the 24-pin version. Both variants share identical electrical characteristics and termination functions.

Replacement Considerations

UCC5680PW24 offers the same functionality in a 24-pin package without the LVD status output pin. UCC5680PWTR variants provide tape-and-reel packaging options for automated assembly processes.