UCC5606PWP

Overview

The UCC5606PWP is a 9-line active terminator for SCSI parallel buses, compliant with SCSI, SCSI-2, and SPI-2 standards. It operates within a supply voltage range of 2.7 V to 5.25 V and features an internal regulator providing a 2.7-V reference. The device supports programmable termination at either 110 Ω or 2.5 kΩ via the DISCNCT pin configuration. Electrical characteristics include a typical supply current of 2 mA in active mode and 0.5 µA in disconnect mode. Output drivers provide -400 mA sourcing current for termination and +400 mA sinking current for active negation. The component is housed in a 24-pin TSSOP package.

Feature Summary

• Compliant with SCSI, SCSI-2, and SPI-2 standards
• Ultra-low channel capacitance of 1.8 pF during disconnect
• Internal trimming ensures termination impedance tolerance of 7% and output current tolerance of 4%
• Integrated thermal shutdown and current limit protection

Applications

• High-performance 3.3-V SCSI systems
• Battery-powered systems requiring low power consumption
• Short bus applications utilizing 2.5-kΩ termination

Procurement Notes

Verify the specific ordering suffix against the manufacturer's official documentation to confirm the exact package type and temperature rating. Confirm that the requested part number matches the required operational specifications before procurement. Ensure compatibility with existing system designs regarding voltage levels and interface requirements.

Selection Notes

Select this component for applications requiring compliance with SCSI and SPI-2 standards. Consider the 24-pin TSSOP package for space-constrained designs. Evaluate the need for hot-pluggability and low standby current capabilities when designing battery-operated equipment.

Part Context

The UCC5606 is designed as a single-ended SCSI terminator offering nine active termination lines. It serves as a direct replacement for legacy Unitrode terminators while providing improved performance through lower operating voltages and reduced channel capacitance. The device integrates essential protections such as thermal shutdown and current limiting.

Replacement Considerations

The UCC5606 is pin-for-pin compatible with other Unitrode 9-line single-ended SCSI terminators. Verify that the DISCNCT pin logic level aligns with the system design, as it is active low in this device.

FAQ

How is the termination resistance configured?

The termination resistance is set by the DISCNCT pin. Driving it high connects 110 Ω termination, while driving it through an 80-kΩ to 150-kΩ resistor connects 2.5-kΩ termination.

What is the maximum sink current capability?

The device can sink up to +400 mA for active negation drivers when all termination lines are actively negated.

Is the device suitable for hot plugging?

Yes, the UCC5606 is completely hot pluggable and appears as a high impedance at the terminating channels when disconnected.