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SN74LV1T34 behavior when powered off

Other Parts Discussed in Thread: SN74LV1T34

Hello,


I need to translate the voltage levels of a uart (RX and TX signals) between two systems that run at 3.3V and 1.8V.

I would like to use two SN74LV1T34 translators, and I have a question, if the level translator is power down (Vcc unconnected or Vcc = GND) and its input (pin A) is at 3.3V, may the level translator be damaged? what is the output voltage (pin Y)?


Thank you

  • Hi Jorge ,

    The translator will not be damaged but i would not suggest to have input while Vcc is off . you can look into the abs max table for the input voltage range which specifies -0.5V to 7V . Since there is no link w.r.t Vcc , you can have the input greater than Vcc without damaging the device . however, output is not recommended to be greater than 0.5V above Vcc .
    There will be no output voltage when Vcc is 0V when you have inputs at 3.3V .