UC5603DPTR

Overview

The UC5603DPTR is a 9-line active terminator for SCSI parallel buses, compliant with SCSI, SCSI-2, and SPI-2 standards. It operates within a Termpwr voltage range of 3.8 V to 5.25 V and an operating temperature range of 0°C to 70°C. The device features a typical channel capacitance of 6 pF during disconnect mode and draws 100 µA in power-down mode. It provides -400 mA sourcing current for termination and +400 mA sinking current for active negation drivers. Internal trimming ensures termination impedance and output current are maintained within a 3% tolerance.

Feature Summary

• Provides 9 lines of active termination for SCSI parallel bus applications
• Features a logic command disconnect that isolates all terminating resistors and disables the regulator
• Includes negative clamping on signal lines to protect against latch-up
• Integrates thermal shutdown and current limit protection mechanisms

Applications

• Active termination at both ends of a SCSI cable segment
• Interim points on a SCSI bus where low channel capacitance minimizes signal integrity impact
• Wide SCSI bus configurations requiring multiple terminator devices

Procurement Notes

Verify component status before procurement as the UC5603DPTR is listed as obsolete by Texas Instruments. Confirm availability through lifetime-buy periods or alternative distributors. Ensure the SOIC-16 package matches your PCB footprint requirements. Validate RoHS compliance details directly with the supplier prior to placing orders.

Selection Notes

Select this component when designing systems requiring 9-line active termination for SCSI interfaces. Compare it against the UC5601 if 18 lines are needed. Consider the UC5603DPTR only if legacy support is required due to its obsolete status. Verify that the 0°C to 70°C operating temperature range meets your environmental specifications.

Part Context

The UC5603 serves as a specialized interface IC within the Texas Instruments portfolio, succeeding the UC5601. It is designed specifically for SCSI bus architectures to maintain signal integrity through precise active termination. The DP suffix indicates a narrow-body SOIC package, while the TR suffix denotes tape-and-reel packaging for automated assembly processes.

Replacement Considerations

The UC5603DPTR is marked as obsolete. No direct replacement part numbers are officially documented in the provided datasheet. Designers should evaluate the UC5601 for higher line count requirements or consult Texas Instruments for current alternatives.