DS2119M/T&R

Overview

The DS2119M/T&R is an Ultra3 LVD/SE SCSI terminator manufactured by Analog Devices Inc./Maxim Integrated. It provides multimode termination for nine signal line pairs, supporting SCSI SPI-2, SPI-3, SPI-4, Ultra160, and Ultra320 standards. The device operates on a 5V supply within a temperature range of 0°C to +70°C. It features a 28-pin TSSOP package with tape and reel packaging. Electrical characteristics include SE termination resistance of 110Ω (±5%) and LVD differential termination resistance of 110Ω. Output capacitance is 3pF, and the device includes thermal shutdown circuitry.

Feature Summary

• Autoselection between Low-Voltage Differential (LVD) and Single-Ended (SE) termination modes based on bus voltage sensing.
• Supports actively negated SE SCSI signals with dedicated power amplifier capabilities.
• Integrated digital filtering on the DIFFSENS control line to prevent erroneous mode switching from high-frequency transients.
• HVD isolation mode that disconnects termination pins when High-Voltage Differential devices are detected on the bus.

Applications

• SCSI Parallel Interface (SPI) compliant host adapters
• Ultra320 and Ultra160 SCSI peripheral controllers
• Legacy single-ended SCSI backplanes requiring multimode compatibility

Procurement Notes

Verify the specific ordering suffix 'T&R' confirms tape and reel packaging rather than bulk. Confirm lead-free status via the '+' designation if required. Check current product lifecycle status as this component may be obsolete. Ensure the 28-TSSOP footprint matches the target PCB design constraints.

Selection Notes

Select this component for designs requiring automatic detection of LVD or SE bus environments without external logic. Verify that the 5V Termpower rail is available and properly decoupled with recommended capacitor values. Consider the 28-TSSOP package size relative to board space limitations. Ensure thermal management supports the operating temperature range up to 70°C.

Part Context

The DS2119M belongs to the Maxim Integrated SCSI interface family, specifically designed as a multimode terminator. It serves as a bridge between legacy single-ended systems and modern low-voltage differential buses. The '/T&R' suffix indicates the unit is supplied in tape and reel format for automated surface-mount assembly processes.

Replacement Considerations

Public confirmed substitute part numbers are not provided in the source material. Consult manufacturer documentation for direct pin-compatible alternatives or updated series replacements.