UCC5619MWPTR

Overview

The UCC5619MWPTR is a 27-line active SCSI terminator designed for high-performance 5V systems. It operates within a supply voltage range of 4V to 7V and provides an internal 2.7V regulator output. The device features a termination impedance trimmed to 110Ω with a tolerance of ±5%. During disconnect mode, the supply current drops to approximately 100µA. The output stage supports sourcing up to -900mA for termination and sinking +500mA for active negation. Channel capacitance during disconnect is typically 2.5pF. It utilizes a QSSOP-36 package.

Feature Summary

• Complies with SCSI, SCSI-2, SCSI-3, SPI, and FAST-20 standards
• Logic command disconnects all termination lines for low-power operation
• Includes thermal shutdown and current limit protection
• Hot-pluggable design with high impedance appearance when disconnected

Applications

• High performance 5V SCSI parallel bus systems
• SCSI controller cards requiring active termination at both cable ends
• Interim points on the bus where signal integrity must be maintained

Procurement Notes

Verify the component status as Active in official Texas Instruments documentation before integration. Confirm that the MWP suffix corresponds to the SSOP-36 wide body package. Ensure the TRMPWR and REG pins are properly bypassed with 4.7µF capacitors to ground as specified in the datasheet. Validate that the operating temperature range aligns with commercial specifications.

Selection Notes

Select this component for applications requiring 27-channel active termination compliant with SCSI-3 specifications. Consider the 100µA power-down current for lower-powered system designs. Evaluate the need for reverse disconnect functionality to maintain signal integrity. Verify compatibility with the 4V to 7V supply voltage range required by the termination circuitry.

Part Context

The UCC5619 belongs to the Unitrode family of terminators manufactured by Texas Instruments. It is offered in the QSSOP-36 (MWP) package variant. The UCC5619MWPTR denotes the tape-and-reel packaging option containing 1000 units per reel. This part serves as a direct replacement for legacy Unitrode SCSI termination solutions.

Replacement Considerations

The UCC5619MWP is the tube-packaged equivalent of the UCC5619MWPTR. Both parts share identical electrical characteristics and pinouts. Verify that the receiving equipment supports tape-and-reel handling if substituting the MWPTR variant for the MWP variant.