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LM26LV: nOVERTEMP output when the LM26LV is not powered

Part Number: LM26LV

Hello. 

Is it safe to use the nOVERTEMP open drain output (pin 3) when the LM26LV is not powered?  (Assuming the voltage at the nOVERTEMP pin is kept between -0.3 and 6V)

Also, is nOVERTEMP guaranteed to be high impedance to ground when the LM26LV is not powered?

Thanks for the help. 

  • Hello,

    I am looking into this. Normally, we see there is a problem when the pull-up voltage is greater than the VDD of the device itself. I will get back with you once I have an answer.

    Thank you,

    Audrey
  • Hello,

    If the pull up voltage at nOVERTEMP is within the max ratings, it will not damage the device with regards to the LM26LV's specs. However, there is potential for latch-up due to the internal ESD structure in a case where the power sequence at nOVERTEMP occurs before VDD of the LM26LV. Thus, the safest connection is to provide voltage at nOVERTEMP from the same supply as VDD of the device.

    The output impedance is expected to be high-Z when VDD is not supplied, however there is a possibility that the internal NMOS gate could be floating depending on the conditions. Thus, the output impedance is not totally guaranteed.

    Regards,

    Audrey
  • Thank you for the detailed reply.  I won't be using the LM26LV when it is unpowered!