UC5601QPTR

Overview

The UC5601QPTR is an active terminator integrated circuit designed for SCSI and SCSI-2 bus standards. It provides precision resistive pull-up to a 2.9V reference for all 18 lines in a Small Computer Systems Interface cable. The device features internal circuit trimming that reduces resistor tolerances to ±3% and adjusts the regulator output voltage to ensure termination current accuracy of ±3%. It includes a disconnect feature that turns off the regulator upon a logic command, significantly reducing standby power. The unit operates with a Termpwr supply voltage range of 4.0V to 5.25V and delivers a typical termination impedance of 110 Ohms.

Feature Summary

• Active termination for 18 SCSI lines with low channel capacitance during disconnect
• Trimmed regulator ensures accurate termination current within specified tolerances
• Logic-controlled disconnect mode minimizes standby power consumption
• Integrated thermal shutdown and current limit protection mechanisms

Applications

• SCSI bus cable active termination
• SCSI-2 compliant system interconnects
• Hot pluggable peripheral interfaces

Procurement Notes

Verify the specific suffix QPTR corresponds to the PLCC package variant when sourcing. Confirm RoHS compliance status as defined by the manufacturer's eco-plan classifications. Ensure the ordering documentation matches the exact part number to avoid discrepancies in pinout or thermal characteristics associated with different package styles.

Selection Notes

Select this component for designs requiring precise 110 Ohm termination on SCSI buses. Consider the PLCC package availability if through-hole or specific surface mount footprints are required. Evaluate the disconnect input requirements to manage power states effectively. Verify thermal resistance specifications against the expected ambient operating conditions.

Part Context

This device belongs to the UC5601 family of SCSI active terminators manufactured by Texas Instruments. The family includes variants such as the UC5601DWP and UC5601N, offering different packaging options like SOIC and PDIP. The UC5601 series addresses the need for accurate termination in high-speed data transfer environments while maintaining low power consumption during idle states.

Replacement Considerations

UC5601DWPTR

FAQ

What is the purpose of the disconnect feature?

The disconnect feature allows the user to turn off the internal regulator and disconnect all terminating resistors via a logic command, which greatly reduces standby power consumption.

How is termination current accuracy maintained?

Internal circuit trimming is used to reduce resistor tolerances to ±3% and adjust the regulator’s output voltage, ensuring termination current accuracy of ±3%.

Does the device support hot plugging?

Yes, the UC5601 meets SCSI hot plugging requirements.