Does anyone know if it is adequate to clamp an input pin on an 08M to V+ with a 1N914 diode if the input to the pin will be up to 12V with a series current limiting resistor of say 1400 ohms. I.E. current limited to about 5 ma with v+ being 5v and input to current limiting resistor of 12v. Thus the input pin might be 0.7v above the V+ being clamped to (voltage across a conducting Si diode). I think this would be about the same as clamping an inductive load with a diode, but exceeds the figure I have seen that an input pin shouldn't go over V+ plus 0.3v. Will the internal clamping of the chip protect it in this case? Any suggestions?
Bob Shaw VE3SUY
Bob Shaw VE3SUY