UCC5640PW24TR

Overview

The UCC5640PW24TR is an active Y-terminator for Low Voltage Differential (LVD) SCSI networks, housed in a 24-pin TSSOP package. It operates within a TRMPWR voltage range of 2.7 V to 5.25 V and supports temperatures from 0°C to 70°C. The device provides differential impedance of 105 Ω and common mode impedance of 150 Ω. It features integrated 1.25 V and 1.3 V regulators, with a typical supply current of 25 mA under no-load conditions. The component includes a disconnect input to disable termination when not at the bus end.

Feature Summary

• Active Y-terminator design optimized for LVD SCSI bus performance
• Automatic detection and disconnection from Single-Ended or High-Voltage Differential drivers
• Integrated dual voltage regulators for stable biasing and control signaling
• Ultra-low channel capacitance to minimize bus loading

Applications

• Termination for Ultra2 (Fast-40) SCSI buses
• Termination for Ultra3/Ultra160 (Fast-80) SCSI buses
• Termination for SPI-4 (Fast-160) and Ultra320 compliant systems

Procurement Notes

Verify that the ordering suffix 'TR' corresponds to the taped and reeled packaging format containing 2,000 devices per reel. Confirm the package type matches the 24-pin TSSOP designation. Ensure the operating temperature range requirement aligns with the specified 0°C to 70°C commercial grade limits before finalizing procurement orders.

Selection Notes

Select this component specifically for Low Voltage Differential (LVD) SCSI implementations. Do not use this device in Single-Ended (SE) or High-Voltage Differential (HVD) systems as it lacks the necessary circuitry for those standards. Ensure the system power supply remains within the 2.7 V to 5.25 V operational window to maintain correct regulator functionality and termination impedance.

Part Context

This device belongs to the UCC5640 family of SCSI terminators manufactured by Texas Instruments. It serves as a critical interface component for maintaining signal integrity on high-speed parallel SCSI buses. The 24-pin variant offers a compact footprint suitable for dense board layouts while providing the necessary electrical isolation and termination characteristics required by legacy storage architectures.

Replacement Considerations

The UCC5640PW28 is the 28-pin equivalent within the same family. Verify pin compatibility if substituting between the 24-pin and 28-pin packages, noting that the LVD status bit is exclusive to the 28-pin version.