[SI-LIST] decoupling capacitors

Hi, everybody.
I'm looking for a method for calculating the appropiated capacitance of 
bypassing capacitors. The most common method is this :
c=I*N*dt/DV
The problem that I find in this method is: What is the typical value ofthe I ( 
current needed to switch a output), I know that this current is function of the 
logic families. 
someone knows how obtain these instantanoeus current?
Thank beforehand.
juanma

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