This is a simple and probably stupid question. When should I use a resistor to limit current into an IC. Most of the data sheets I have been reading do not give any suggestions or any info. That is except for one IC I was going to use that had an internal zener diode, that one said to have a "sufficiently high input impedance "lol
Anyways back to the main thing, for example I am using a PIC10F222 and it says it draws 1.1mA in the data sheet max but in the absolute max section it says "input clamp current : +-20mA". It is that last part I do not get, because if it only draws 1.1mA in what condition would it draw 20mA or more?
So when testing/prototyping I just have been putting a 150ohm resistor on all the inputs of my ICs (the other 2 are IRS2186's) and I mean it has worked fine but when I make the transition to PCB any space I could save would useful
thanks
Anyways back to the main thing, for example I am using a PIC10F222 and it says it draws 1.1mA in the data sheet max but in the absolute max section it says "input clamp current : +-20mA". It is that last part I do not get, because if it only draws 1.1mA in what condition would it draw 20mA or more?
So when testing/prototyping I just have been putting a 150ohm resistor on all the inputs of my ICs (the other 2 are IRS2186's) and I mean it has worked fine but when I make the transition to PCB any space I could save would useful
thanks