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TUSB2046B: Running the device on the edge of supply specs

Franz Schellhase
Expert 3605 points
Part Number: TUSB2046B

Hi team,

A customer is using TUSB2046BIRHB at 3.3V supply voltage, which is on the edge of the specification in the datasheet. Small fluctuations in voltage is always hard to avoid. So the voltage might drop a little below from time to time. I understand that we can't guarantee anything outside specs. But what is your judgement, are chances high or low that running the device on the edge of the specs cause malfunctions?

Thank you,

Franz

  • 0
    TI__Guru 60870 points

    Hi Franz,

    With the datasheet indicating a supply range of 3.0V - 3.6V for the commercial version of the device and a range of 3.3V - 3.6V for the industrial version, that implies the range was narrowed to avoid a possible issue / low margin at the temperatures outside the commercial range.   I don't have any specifics on why that change was made and of course, we cannot guarantee operation outside the datasheet specs, but I would not expect to see any malfunction from small fluctuations in the supply.

    Regards,

    JMMN

  • 0 in reply to JMMN
    Prodigy 60 points

    Hi JMMN,

    I´m the original requester. First thank you for your fast response. Totally understand that TI can not guarantee operation outside the datasheet specs. Nevertheless I´m a bit confused as you recommend supply to be 3,45V in another topic (see https://e2e.ti.com/support/interface/f/138/t/902229?tisearch=e2e-sitesearch&keymatch=TUSB2046BI

  • 0 in reply to Daniel Nideröcker
    TI__Guru 60870 points

    Hi,

    For guaranteed operation across the industrial temperature range I would still recommend setting the centering the "3.3V" rail at 3.45V (or at some value above 3.3V) to protect against any fluctuations.   That said, I wouldn't expect to see device malfunctions if the voltage dipped to 3.2V during normal operation.

    Let me know if that is not clear.

    Thanks!

    JMMN