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SN74LV1T126: SN74LV1T126

Hen
Expert 1070 points
Part Number: SN74LV1T126

Hello,

Can i supply an active high input (on pin ‘A’) while the part is not powered (VCC supply is OFF)?

  1. Can it damage the part in any way?
  2. Can current from the input pin ‘A’ leak to the VCC pin?
  3. In what state will the output pin ‘Y’ is expected to be in such case? Is it guaranteed by design to have a valid value?

Thanks

  • 0
    TI__Guru* 97046 points

    Hi Hen,

    In the Absolute Maximum Ratings table of the datasheet, the "Input voltage range" (VI) is listed as -0.5 to 7.0 V. Since neither of these numbers mentions the supply voltage, it is safe to apply any voltage in that range to the input.

    To answer directly:

    1. It will not damage the device.

    2. Yes, current can leak through the device from one pin to any other pin, however the values will be extremely small (expect fA range for input to Vcc leakage on a part without input clamp diodes since the only path for current is through the gate of a mosfet).

    3. Since there is no power to the supply, the output will not be driving high or low, however the output does have parasitic diodes to ground and Vcc. The output on this device should not be forced to voltages outside +/- 0.5V while in the off state.