I have used schottky diodes tied to +5V and GND in order to protect the input pins of a microcontroller from over voltage and negative voltage.
However, I am not sure if I need to use the same methods if I am feeding a 74LS165 shift register? In the datasheet it does not show a max voltage rating but it does show a minium voltage (which I assume is voltage threshold for the logic).
Am I safe with just a current limiting input resistor or should I be adding more protection?
The max voltage that would be accidently connected in this system is +/-12V
thanks!
However, I am not sure if I need to use the same methods if I am feeding a 74LS165 shift register? In the datasheet it does not show a max voltage rating but it does show a minium voltage (which I assume is voltage threshold for the logic).
Am I safe with just a current limiting input resistor or should I be adding more protection?
The max voltage that would be accidently connected in this system is +/-12V
thanks!