For 5v “HIGH” is 5v and “LOW” is 0v, right?
Well, not quite - having inadvetently created a voltage divider on an input to an IC I found it isn’t quite the case!
So a bit of research starting with the datasheet for the IC revealed nowt.
More general research (my friend google) came up with the following definitions for a 5v supply
LOW = 0 - 1.5 v
HIGH = 3.5 - 5v
But I couldn’t find a formula for calculating different values for different voltages, or even whether this is an industry standard for IC’s.
Does anyone know of such a formula,or can provide a link to one?
Thanks - Richard