Tuesday 12 September 2017

Series resistor on digital signal lines



I have seen many schematics using 22 ohm resistor in series with digital signal lines. I was wondering is this always a MUST or there are there some special scenarios where we don't need them since they lower the signal's bandwidth.


For instance, are they needed on 48MHz signal line which is cca. 2cm long?


Is this somehow connected to STM32 output speed capabilities (low, high, ultra high speed, etc.)?




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