DS2120E+

Overview

The DS2120E+ is an Ultra3 LVD SCSI terminator manufactured by Analog Devices Inc./Maxim Integrated. It provides low-voltage differential termination for nine signal line pairs in a 28-pin TSSOP package. The device operates within a voltage range of 2.7V to 5.5V and supports temperatures from 0°C to +70°C. Key electrical parameters include a typical differential mode termination resistance of 110Ω, common mode termination resistance of 190Ω, and output capacitance of 3pF. Termpower current ranges from 12mA to 30mA.

Feature Summary

• Fully compliant with Ultra3, Ultra160, Ultra320, and Ultra2 (LVD only) SCSI standards
• Integrates laser-trimmed resistors with zero temperature coefficient for precision termination
• Features built-in mode change filter/delay and on-board thermal shutdown circuitry
• Supports SCSI bus hot plug compatibility through automatic LVD termination selection

Applications

• RAID Systems
• SCSI Host Bus Adapter Cards (HBA)
• Servers
• Network Attached Storage (NAS)
• Storage Area Networks (SANs)

Procurement Notes

Verify the specific ordering suffix to confirm the package type and tape/reel configuration. Ensure the component meets RoHS compliance requirements if applicable to your manufacturing process. Confirm that the lead-free designation aligns with your assembly specifications before finalizing procurement orders.

Selection Notes

Select this component when designing systems requiring Ultra3 or later LVD SCSI termination. Ensure the design accommodates the 28-pin TSSOP footprint and the required decoupling capacitors for VREF and TPWR pins. Verify that the system operates within the specified 0°C to +70°C temperature range and 2.7V to 5.5V supply voltage limits.

Part Context

The DS2120E+ belongs to the DS2120 series of Ultra3 LVD SCSI terminators. It serves as a critical interface component for managing signal integrity in high-speed SCSI buses. The device automatically detects bus conditions and isolates itself if non-LVD devices are present, ensuring safe operation across mixed-technology environments.

Replacement Considerations

The DS2120B is a pin-compatible alternative available in a 36-pin SSOP package. Both devices share the same core functionality and electrical characteristics but differ in physical packaging dimensions.