I need a bunch of inputs, so I'm using an i2c port expander. The one I've chosen runs on 3.3v, but tolerates 5v inputs. I don't see any documentation on the operation of the inputs.
I'm trying to avoid wasting 32 clamp diodes if I don't need them.
Q: Generally speaking, if I feed a 2mA current-limited inductive glitch into a +5v-tolerant input, Vdd=3.3v, is the glitch voltage clamped by the device input? At what voltage? Most importantly, is the device damaged?
The datasheet says inputs can handle +6v max and +/-20mA per input.
If needed I guess I could use a dummy logic device as a clamp-diode array. Hmmm.