Sorry for this basic question but I am not finding a simple answer to it
Lets say we have a input signal(a node) that we expect to be in the range from 0V to 5.4V. To make sure that it never exceeds it, a schottky diode with +5V on cathode is added.
This way, when the input voltage is 5.4 (assuming Vf of diode as 0.4V), then the diode becomes forward biased and the node is prevented to see voltage greater than 5.4v.
My question is does this have any adverse effect on the +5volt supply? What is the input signal sees a voltage of 12V? What will happen to the +5 supply then?