UCC5617DWPTR

Overview

The UCC5617DWPTR is an 18-line SCSI active terminator designed for high-performance 5V systems. It provides a nominal 110-ohm termination impedance, trimmed to within 5% accuracy. The device operates with a supply voltage range of 4.0V to 5.25V and draws only 50µA in disconnect mode. Key electrical parameters include a maximum sourcing current of -650mA and a sinking capability of +400mA. Channel capacitance during disconnect is typically 2pF. The component supports hot plugging and includes thermal shutdown and current limit protection.

Feature Summary

• Complies with SCSI, SCSI-2, SCSI-3, SPI, and FAST-20 standards
• Features low channel capacitance of 2pF during disconnect to preserve signal integrity
• Supports full hot-plugging with high impedance appearance when disabled
• Includes internal circuit trimming for precise impedance and output current control

Applications

• Active termination at both ends of SCSI parallel buses
• High-performance 5V SCSI system implementations
• Termpwr 4.0V to 5.25V power bus applications

Procurement Notes

Verify the specific ordering suffix against the manufacturer's latest documentation to confirm package type and environmental compliance. Confirm that the component status aligns with project requirements, as availability may be limited for older interface components. Ensure design compatibility with existing bus architectures before finalizing procurement orders.

Selection Notes

Select this component for designs requiring compliant active termination for SCSI or SPI interfaces. Verify that the system operates within the specified 4.0V to 5.25V TRMPWR range. Consider the 28-pin wide body SOIC package constraints and thermal management needs for the 18-channel configuration. Ensure the application benefits from the low-power disconnect mode if bus reconfiguration is frequent.

Part Context

This device belongs to the Unitrode family of terminators, originally designed for robust SCSI bus applications. It serves as a pin-for-pin compatible alternative to the UC5609. The UCC5617 addresses signal integrity issues common in interim termination points by minimizing channel capacitance when disconnected.

Replacement Considerations

The UC5609 is a pin-compatible predecessor. Verify functional equivalence and check for updated RoHS compliance status if replacing legacy inventory.