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LMV393 - can pull output up to 5V when powered at 3.3V?

PaulSchoenke
Genius 3290 points
Other Parts Discussed in Thread: LMV393, LM393

Hello:

Spec for LMV393 says Vout should be held to Vcc + .3V. The schematic shows an open collector transistor output. Can I safely run the comparator at 3.3V and pull the output up to 5V?

Thanks!

Paul

  • 0
    Genius 5430 points

    Paul;

    There is precious little useful information in the 29 page data sheet. The author must have been getting paid by the page. Without some discussion of the topology or even application or test circuits, a user is left in the dark about its behavior. This is a good example of a very poor data sheet. I hope someone can answer your question.

  • 0
    TI__Guru**** 166116 points

    Paul,

    The schematics in data sheets for newer devices are less literal than they have been in the past. Anytime a pin is limited to 0.3V beyond a power supply rail, that is strong evidence that an internal diode is present. The LMV393 has ESD diodes to ground and VCC on all pins.

    The output can not be 5V in this case.

    The LM393 can have a 5V output with 3.3V supply, but the common mode range of the LM393 is less than the LMV393.

    Regards,
    Ron Michallick