I have a design which utilizes the LM2901D voltage comparator. There are conditions where the one input may go more negative than the GND pin. Will this damage the part if the input current is limited?
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I have a design which utilizes the LM2901D voltage comparator. There are conditions where the one input may go more negative than the GND pin. Will this damage the part if the input current is limited?
Tom,
The comparator will not be damaged if the current is limited to less than 10mA. However, the output may invert (wrong state) when input(s) are below ground.
Regards,
Ron Michallick
Ron,
Do you know of a TI part which will not have the output invert with inputs below ground (or above VCC) assuming proper current limiting?
Thanks,
Mitch
Mitch,
I believe there may be one, but it's not easily searchable. I also believe the last one I saw was an op-amp not a comparator.
Best is to use low current and a Schottky diode to stop inversion. Sometime it is acceptable to characterize the inversion and note which input inverts and which one does not. Keep in mind that a future die release may have a different inversion response.