UCC5606DP

Overview

The UCC5606DP is a 9-line active terminator for SCSI parallel buses, compliant with SCSI, SCSI-2, and SPI-2 standards. It operates within a 2.7-V to 5.25-V supply range and features an internal regulator providing a 2.7-V reference. The device supports programmable termination of either 110 Ω or 2.5 kΩ via the DISCNCT pin. Electrical characteristics include a typical supply current of 2 mA in active mode and 0.5 µA in disconnect mode. Output drivers provide up to -400 mA sinking current for active negation. Termination impedance is trimmed to 7% tolerance, while output current is trimmed to 4%. The SOIC-16 package includes a heat sink ground (GND*) connected to Pin 9.

Feature Summary

• Complies with SCSI, SCSI-2, and SPI-2 standards
• Ultra-low channel capacitance of 1.8 pF during disconnect
• Internal thermal shutdown and current limit protection
• Pin-for-pin compatible with legacy Unitrode terminators

Applications

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

Procurement Notes

Verify the specific ordering suffix against the official datasheet to confirm the package type and temperature range. The DP suffix indicates a 16-pin narrow body SOIC package suitable for commercial temperatures (0°C to 70°C). Ensure that the GND* pin on the SOIC package is properly connected to a large copper area or grounding plate to manage thermal dissipation effectively.

Selection Notes

Select the UCC5606DP when designing standard-length SCSI buses requiring 110-Ω termination. Use the 2.5-kΩ configuration by connecting an 80-kΩ to 150-kΩ resistor between the DISCNCT pin and TRMPWR for short bus applications. Ensure the system voltage remains within the 2.7-V to 5.25-V operating range to maintain proper regulator function and signal integrity.

Part Context

The UCC5606 series provides active termination for small computer systems interface (SCSI) parallel buses. The device is designed to meet SCSI hot-plugging requirements and appears as high impedance at terminating channels when VTRMPWR is 0 V or open. It serves as a direct replacement for older single-ended SCSI terminators while offering improved low-voltage operation capabilities.

Replacement Considerations

The UCC5606DP is pin-for-pin compatible with other UCC5606 variants such as the UCC5606N (DIL-16) and UCC5606PWP (TSSOP-24), provided the package footprint matches the design. Verify that the DISCNCT logic polarity aligns with the system design, as this variant uses active-low disconnect logic.