Quote Originally Posted by schu4647 View Post
I am seeing -2Volts for about 25ns. Why is this ok? I assume it is since this is a very common method for reading switch inputs on micros and various other IC's but it violates the minimum voltage of the pin.
Hi, schu

1) note most of the the inputs have clamp diodes to VDD and VSS ... ( Hi , Charles ...)

sooo ... not less than - .6 volts ...

2) min Detection time of Pic® pins is 50 ns ...

Alain