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How do I clamp output of voltage supervisor circuit to 0.0V until power is good?

Mike Thielman
Prodigy 80 points
Other Parts Discussed in Thread: TPS3839

I need a POR circuit monitoring 3.3V, but I need the output to be guaranteed all the way down to 0.0V VCC.  Typical circuits have the output rise up to perhaps 1V as power rises to 1V, then the circuit will become valid and the output will go to the reset state of 0V.

 

Is there a simple way to clamp that output to 0V until the 3.3V reaches valid levels?

 

I have a solution that involves -12V and a significant number of parts, I'm wondering if there is a clever circuit that can do this with a single part or small number of parts.  Using -12V is OK but it would be great if it could be done with just 3.3V supply.

  • 0
    TI__Mastermind 43630 points

    HI Mike,

    If the output is not floating up do to backdrive from something else then adding a NFET in GND will help to keep the IC's RESET low from from 0 to 0.9V (TPS3839 example):

    Please note; this is just a concept and has not been tested. Recommend trying before making schematics.

    I hope this helps