DS21S07AE

Overview

The DS21S07AE is a SCSI terminator IC compliant with SCSI-1, Fast SCSI, and Ultra SCSI standards. It integrates a regulator and nine precise switched 110 Ω termination resistors into a monolithic device housed in a 20-pin TSSOP package. The component operates within a TERMPWR voltage range of 4.00V to 5.50V and supports an operating temperature range of 0°C to +70°C. It provides active termination for nine signal lines, featuring laser-trimmed resistors with 2% tolerance and a low drop-out voltage regulator.

Feature Summary

• Provides active termination for nine signal lines with integrated regulation
• Supports hot plug operations through power-down mode isolation
• Includes on-board thermal shutdown circuitry for protection

Applications

• Termination at both ends of cable segments in SCSI systems with single-ended drivers
• Integration into disk drives requiring SCSI bus compliance
• RAID system components acting as targets on a SCSI bus

Procurement Notes

Verify the specific suffix 'E' confirms the 20-pin TSSOP package variant rather than the standard SOIC version. Confirm lead-free status if '+ ' is required. Check current availability as this component may be discontinued or subject to limited supply constraints from Analog Devices/Maxim Integrated distributors.

Selection Notes

Select the DS21S07AE when a 20-pin Thin Shrink Small Outline Package is required for space-constrained designs. Ensure the design accommodates the necessary external decoupling capacitors (4.7 µF) for the VREF pins. Verify that the application requires termination for exactly nine signal lines per device instance.

Part Context

This component belongs to the DS21S07A family of SCSI terminators manufactured by Maxim Integrated, now part of Analog Devices Inc. The 'AE' designation specifically identifies the 20-pin TSSOP plastic package variant, distinguishing it from the 16-pin SO package version (DS21S07AS).

Replacement Considerations

The datasheet notes backward compatibility with the DS2107 and DS2107A. However, pinout and package differences must be evaluated before substitution. No direct cross-reference part numbers are provided in the source material.