DS2119M

Ultra3 LVD/SE SCSI Terminator


Please check latest availability status for a specific part variant.

Description

The DS2119M Ultra3 LVD/SE SCSI terminator is both a low-voltage differential (LVD) and single-ended (SE) terminator. The multimode operation enables the designer to implement LVD in current products while allowing the end-user SE-backward compatibility with legacy devices. If the device is connected in an LVD-only bus, the DS2119M will use LVD termination. If any SE devices are connected to the bus, the DS2119M will use SE termination. This is accomplished automatically inside the part by sensing the voltage on the SCSI bus DIFFSENS line.

For the LVD termination, the DS2119M integrates two current sources with nine precision resistor strings. For the SE termination, one regulator and nine precision 110Ω resistors are used. Three DS2119M terminators are needed for a wide SCSI bus.
DS2119M: Block Diagram DS2119M: Block Diagram Enlarge+

Key Features

  • Fully Compliant with SCSI SPI-2, SPI-3, SPI-4, Ultra160, and Ultra320
  • Provides Multimode Low-Voltage
    • Differential/Single-Ended (LVD/SE)
    • Termination for Nine Signal Line Pairs
  • Autoselection of LVD or SE Termination
  • 5% Tolerance on SE and LVD Termination Resistance
  • Low Power-Down Capacitance of 3pF
  • On-Board Thermal Shutdown Circuitry
  • SCSI Bus Hot Plug Compatible
  • Fully Supports Actively Negated SE SCSI Signals

Quality and Environmental Data

Product Reliability Reports: DS2119M.pdf 
Lead-Free Package Tin (Sn) Whisker Reports

Tools & Models

  • DS2119ME_LVD IBIS Model
  • Device   Fab Process   Technology   Sample size   Rejects   FIT at 25°C   FIT at 55°C  

    Note : The failure rates are summarized by technology and mapped to the associated material part numbers. The failure rates are highly dependent on the number of units tested.

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