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SN74LV4052A-Q1: The impact of leakage current to Y0

Part Number: SN74LV4052A-Q1
Other Parts Discussed in Thread: TS3A5017-Q1

Tool/software:

Hi,  I want to know the impact of the condition shown below:

VCC=0V & input leakage current of Y0=100uA

Will it damage the chip or make the chip work abnormally when VCC is pulled high?

Thanks!

  • The Y0 pin has a clamping diode to VCC. If the diode current is not limited, it might damage the device. A current flowing into VCC can (partially) power up the switch itself (below 1 V, correct operation is not guaranteed) and any other devices connected to VCC.

    In general, you should either

    • keep the switch powered at all times (pull INH high to disable all I/Os), or
    • use a switch with powered-off protection like the TS3A5017-Q1.
  • What’s the current limit value of the clamping diode? 

  • Oh I see. It's about 50mA. So 100uA won't damage the chip, right? And I measured VCC, it is 0.5mV.  It seems that it doesn't power up the switch.

  • Hello Wang,

    In a scenario where the voltage on a io pin like Y0 exceeds the supply voltage by 0.5V to 0.7V the esd diode inside of this device would activate.

    If you limit the current to below 50mA(100uA in your scenario) then the device and its internal esd diode path should not sustain permanent damage and should be fine for future operation, however its future operation is not guaranteed 

    Check out this FAQ that explains more.

    However if you would like to use a simpler solution like the ones Clemens pointed out earlier those will also work.

    Regards,

    Kameron