Hi team,
Could you pls help clarify, if customer V+ is 12V (within 36V rating), IN- is below (V+ )-1.5V, can IN+ go up to beyond (V+ )-1.5v, eg 18V? Device still functions normally in this case, right?
Thanks
Scarlett
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Hi team,
Could you pls help clarify, if customer V+ is 12V (within 36V rating), IN- is below (V+ )-1.5V, can IN+ go up to beyond (V+ )-1.5v, eg 18V? Device still functions normally in this case, right?
Thanks
Scarlett
That depends on your definition of "normally". Section 2.5 of the Application Design Guidelines for LM339, LM393, TL331 Family Comparators says:
[…] While this is a nice feature, it does come at a cost. When operating outside the specified input voltage limits, performance deteriorates and will no longer meet the data sheet specifications. Critical specifications such as offset voltage, bias current and propagation delay will be adversely affected. TI still recommends to stay within the data sheet input voltage range specifications.
Hi Scarlett,
Both Clemens and Kai have given great inputs. You can use this feature but it is still operating outside the recommended input voltage range, so we cannot warranty the behavior. It is just expected behavior. Dividing down the input to meet the input voltage range is a good suggestion as Kai mentioned.