UC5603DP

Overview

The UC5603DP 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 supports signal line voltages from 0 V to 5 V. The device provides -400 mA sourcing current for termination and +400 mA sinking current for active negation drivers. It features a typical channel capacitance of 6 pF during disconnect mode and draws 100 µA in power-down mode. Internal trimming ensures impedance and output current tolerances of 3%.

Feature Summary

• Provides 9 lines of active termination for SCSI parallel bus applications.
• Features a logic command disconnect that disables the regulator and opens terminating resistors to reduce standby power.
• Includes negative clamping on all signal lines to protect external circuitry from latch-up.
• Offers thermal shutdown and current limit protection for reliable operation.

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 combined use of 18-line and 9-line terminators.

Procurement Notes

Verify component status before procurement as the UC5603DP is listed under LIFEBUY status by Texas Instruments. This indicates the device will be discontinued, though a lifetime-buy period may be available. Confirm availability through authorized distributors or TI directly, as standard production support may be limited compared to active components.

Selection Notes

Select the UC5603DP when designing systems requiring 9-line active termination for SCSI interfaces. Ensure the design accommodates the SOIC-16 package dimensions and thermal requirements. Consider pairing with the UC5601 for complete 18-line termination needs. Verify that the operating temperature range of 0°C to 70°C aligns with system environmental constraints.

Part Context

The UC5603 serves as a specialized interface component within Texas Instruments' legacy portfolio, designed specifically for high-speed parallel data transmission standards like SCSI. It complements broader interface solutions by providing precise termination control, ensuring signal integrity across multi-device bus architectures common in industrial and computing peripherals.

Replacement Considerations

The UC5603DPG4 is an equivalent RoHS-compliant variant of the UC5603DP. Both devices share identical pinouts and electrical characteristics, allowing for direct substitution in existing designs without hardware modifications.