UCC5614DPTR

Overview

The UCC5614DPTR is an obsolete SCSI interface integrated circuit manufactured by Texas Instruments. It provides nine lines of active termination for small computer system interface parallel buses, complying with SCSI, SCSI-2, and SPI-2 single-ended standards. The device operates within a voltage range of 2.7 V to 5.25 V and features a low channel capacitance of 1.8 pF during disconnect mode. Supply current in power-down mode is typically 0.5 µA. It supports programmable termination at 110 Ω or 2.5 kΩ, includes a -400 mA sourcing current capability for termination, and offers +400 mA sinking current for active negation drivers.

Feature Summary

• Complies with SCSI, SCSI-2, and SPI-2 single-ended standards
• Ultra-low channel capacitance eliminates signal integrity effects from disconnected terminators
• Programmable termination impedance selectable between 110 Ω and 2.5 kΩ
• Supports complete hot plugging with high impedance appearance when unpowered

Applications

• Active termination for standard SCSI bus segments
• Short bus applications utilizing 2.5 kΩ termination
• High-performance 3.3-V SCSI systems requiring low operating voltage
• Battery-powered systems benefiting from ultra-low power-down current

Procurement Notes

This component is officially classified as obsolete by the manufacturer. Production has been discontinued, meaning it is no longer available through standard new manufacturing channels. Verification of authenticity is critical when sourcing from secondary markets. Designers should confirm that existing stock meets specific lot trace requirements and assess long-term availability risks before finalizing any procurement plans.

Selection Notes

Select this device only for maintenance of legacy systems where pin compatibility with older Unitrode terminators is required. Verify that the application strictly adheres to the specified 0°C to 70°C temperature range. Ensure the design accommodates the 16-pin narrow body SOIC package constraints. Consider modern alternatives if new designs are being developed due to the obsolete status.

Part Context

The UCC5614 belongs to the UCC561 family of SCSI terminators produced by Texas Instruments following its acquisition of Unitrode. It serves as a direct replacement for previous generation 9-line SCSI terminators, offering improved electrical characteristics such as lower capacitance and tighter trimming tolerances while maintaining physical pinout compatibility.

Replacement Considerations

No public confirmed substitute part numbers are documented.