Re: LM339 comparator input levels

David Novak wrote:
I find two input voltage specifications in the LM339 data ***, Vidr (input differential range = 36V) and Vicmr (input common mode range, -0.3V to Vcc). I understand Vidr, but how do I interpret Vicmr? Is this stating the voltage range of the inputs if they move together at the same rate? In other words, the DC offset that effects both inputs equally?

Since the Vidr specification does not refer to Vcc, it appears that I can set IN- = 1V, Vcc = 5V and let IN+ swing from 0V to 36V. Is this correct? I am worried about letting either input exceed Vcc.

You are correct. It is fine to exceed Vcc with either input. This device is fairly unusual in this respect.
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