UCC5640PW24G4

Overview

The UCC5640PW24G4 is an active Y-terminator designed for low voltage differential (LVD) SCSI networks. It operates within a supply voltage range of 2.7 V to 5.25 V and supports Ultra2, Ultra3, Ultra160, and Ultra320 standards. The device provides a differential impedance of 105 Ω and a common mode impedance of 150 Ω. It features a 1.5-pF channel capacitance per line pair to minimize bus loading. The component includes a disconnect input to disable termination when not at the bus end, ensuring high-impedance states during power-off or SE/HVD detection.

Feature Summary

• Active LVD-only terminator with automatic SE/HVD disconnection
• Compliant with SPI-2 through SPI-4 SCSI standards
• Low channel capacitance for minimal bus loading

Applications

• Termination for LVD SCSI data buses
• System migration from single-ended to LVD architectures
• High-speed peripheral interconnects requiring Ultra320 compliance

Procurement Notes

Verify the G4 suffix indicates lead-free and RoHS-compliant manufacturing status as per Texas Instruments specifications. Confirm the package type matches the required PCB layout constraints. Ensure the operating temperature range aligns with the system environment requirements before finalizing procurement orders.

Selection Notes

Select this component specifically for low voltage differential SCSI applications. Do not use in single-ended or high voltage differential systems due to automatic disconnection behavior. Verify that the board layout accommodates the TSSOP-24 package dimensions and spacing requirements for optimal signal integrity.

Part Context

This part belongs to the UCC5640 family of active terminators. The PW24 designation specifies the 24-pin Thin Shrink Small Outline Package variant. The G4 suffix denotes environmental compliance. It serves as a critical interface component for maintaining signal integrity in high-speed parallel SCSI environments.

Replacement Considerations

The UCC5640PW28G4 is a compatible alternative offering identical functionality in a 28-pin package. Verify pin compatibility and physical footprint differences before substitution.