DS21T05Z+

Overview

The DS21T05Z+ is a SCSI terminator integrated circuit manufactured by Analog Devices Inc./Maxim Integrated. It provides active termination for nine signal lines in SCSI systems, compliant with SCSI-1, Fast SCSI, and Ultra SCSI standards. The device operates within a supply voltage range of 4.0 V to 5.5 V and functions at temperatures between 0°C and +70°C. It integrates laser-trimmed 110-ohm termination resistors with 5% tolerance and includes onboard thermal shutdown circuitry. The component is housed in a 16-pin narrow SOIC package.

Feature Summary

• Fully compliant with SCSI-1, Fast SCSI, and Ultra SCSI standards
• Provides active termination for nine signal lines with low dropout voltage
• Power-down mode isolates termination resistors from the bus
• Supports SCSI bus hot-plug operations

Applications

• Active termination for SCSI cable segments
• Disk drive interface circuits
• RAID system components

Procurement Notes

Verify the manufacturer part number DS21T05Z+ against official documentation to ensure authenticity. Confirm that the 16-pin narrow SOIC package matches design requirements. Check RoHS compliance status as indicated in the datasheet. Ensure the operating temperature range of 0°C to +70°C aligns with the application environment before procurement.

Selection Notes

Select this component for high-volume applications requiring active SCSI termination without the higher performance specifications of the DS21T07. Ensure the design accommodates the 110-ohm termination resistance and the required 4.7 µF decoupling capacitor on the VREF pins. Verify that the power-down pin configuration meets the system's control logic needs.

Part Context

The DS21T05Z+ belongs to the DS21T05 series of SCSI terminators. It serves as a functionally compatible alternative to the DS21T07, targeting cost-sensitive, high-volume manufacturing scenarios. The 'Z+' suffix typically indicates lead-free packaging compliant with environmental directives, though specific ordering details should be confirmed via the manufacturer's current catalog.

Replacement Considerations

The DS21T07 is a functionally compatible high-performance alternative. Verify if the relaxed output current and termination tolerances of the DS21T05Z+ are acceptable for the specific application requirements.