UCC5606DPTR

Overview

The UCC5606DPTR is a 9-line active SCSI terminator manufactured by Texas Instruments in a 16-pin SOIC package. It operates within a supply voltage range of 2.7 V to 5.25 V and supports an operating temperature range of 0°C to 70°C. The device provides programmable termination impedance, selectable between 110 Ω for standard bus lengths and 2.5 kΩ for short buses. Electrical characteristics include a typical output current of -23 mA at 110 Ω termination and a maximum sourcing/sinking capability of ±400 mA. In disconnect mode, the supply current drops to a typical value of 0.5 µA, while channel capacitance during disconnect is specified at 1.8 pF.

Feature Summary

• Complies with SCSI, SCSI-2, and SPI-2 standards
• Supports complete hot plugging without system disruption
• Features ultra-low channel capacitance to preserve signal integrity
• Includes internal thermal shutdown and current limit protection

Applications

• Active termination for small computer systems interface (SCSI) parallel buses
• High-performance 3.3-V SCSI system designs
• Battery-powered systems requiring low power consumption in disconnect mode

Procurement Notes

Verify the specific ordering suffix against the manufacturer's official documentation to confirm the exact package type and reel quantity. Confirm that the component status aligns with current production requirements, as availability may vary across different package variants such as TSSOP or DIP. Ensure all electrical parameters meet the design specifications before finalizing procurement decisions.

Selection Notes

Select this component when designing SCSI interfaces requiring active termination compliance with industry standards. Consider the 110-ohm versus 2.5-kohm termination options based on physical bus length constraints. Evaluate the low-power disconnect feature if the application involves battery operation or intermittent usage scenarios where minimizing standby current is critical.

Part Context

This device belongs to the UCC5606 family of SCSI terminators produced by Texas Instruments. It serves as a direct replacement for legacy Unitrode single-ended SCSI terminators, offering pin-for-pin compatibility with updated features like active-low disconnect control. The product line addresses the need for reliable data transmission in parallel bus architectures.

Replacement Considerations

The UCC5606N and UCC5606PWP are pin-compatible alternatives within the same family. Verify that any substitute maintains the required 16-pin narrow body SOIC footprint and matches the electrical performance specifications outlined in the datasheet.

FAQ

How does the DISCNCT pin function?

Driving the DISCNCT pin low causes the nine termination channels to become high impedance and places the chip into a low-power mode.

What is the purpose of the REG pin?

The REG pin serves as the output for the internal 2.7-V regulator, providing a stable reference voltage for the termination circuitry.

Can the UCC5606 be used in wide SCSI configurations?

Yes, multiple UCC5606 devices can be utilized together to provide active termination for wide SCSI bus configurations.