• State Resolved
  • Locked Locked
  • Replies 3 replies
  • Subscribers 34 subscribers
  • Views 2886 views
  • Users 0 members are here
Support feedback
Options
Options
Related

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

DS125MB203: cold sparing?

Michael T Schneider
Expert 3790 points
Part Number: DS125MB203


Is the DS125MB203 cold sparing?  I couldn’t see that in the datasheet.

  • 0
    TI__Expert 8165 points
    Hello Michael,

    What is your definition of a device that can be a cold spare? I'm assuming, the device would need to have all I/Os high-impedance when VDD=0V? What would be the max Ioff leakage current requirement? Across what VIN range?

    Regards,
    Davor
  • 0 in reply to Davor Glisic
    TI__Expert 3790 points

    At least the outputs or combined I/O channels should be at high impedance when the device is powered off.  This is most likely where the cold sparing capability will be needed.  Another definition would include all the inputs as well.  Another definition would include all the outputs, inputs, combined I/O, and control signals.  Leakage current would depend on the technology of the device and how good the chip designer is at getting it as low as possible.  I don’t believe there is any actual standard for maximum leakage current, other than it must have an insignificant effect on any device controlling the bus. 

  • 0 in reply to Michael T Schneider
    TI__Expert 8165 points
    Hello Michael,

    Like all high-speed interface devices, the DS125MB203 is exclusively intended for point-to-point connections. That is, there may only be a single TX driving a single RX over a transmission line. It is not recommended to have a second TX or RX (even as a cold spare) connected to the transmission line.

    Regards,
    Davor