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SN74LVC2G34-EP and SN74LVC1G126-Q1 question

John Vranes
Intellectual 590 points
Other Parts Discussed in Thread: SN74LVC2G34-EP, SN74LVC1G126-Q1, SN74LVC1G126

Hello,

If an output from SN74LVC2G34-EP or SN74LVC1G126-Q1 is pulled up to 3.3V through a 10kohm resistor while the device is unpowered, is that okay?  Or could it damage the parts somehow (e.g., due to back-powering the output with the pull-up)?

Thanks

  • 0
    TI__Guru* 96681 points
    It will not damage the part. The outputs on the SN74LVC1G126 (all variants) are protected from this by Ioff 'Partial Power Down Mode' -- when the device is off, the most current that can be sourced/sunk from the chip is 10 uA.
  • 0 in reply to Emrys Maier
    Intellectual 590 points
    Thanks, Emrys. The wording in datasheets for these two parts seem to apply Ioff to the Power On to Power Off transition. Plus, it's referred to as a "Partial". So to clarify, does this protection also apply to when these parts are without power for a prolonged period of time (as opposed to perhaps just a short duration as some partial power level)?
    Thanks again
  • 0 in reply to John Vranes
    TI__Guru* 96681 points
    The 'partial' reference is specifically aimed towards a system-level view. If you want to power down only this chip and leave the rest of the system running, there will be no problem for extended periods of time.