Normally for digital devices the datasheet will advise values but if you wanted to calculate your own you could measure the changes in current, time periods of any pulses, and select a delta V (dV) to give you a value of C.Hi,
For decoupling we just use capacitor like 1uF Bulk and 0.1uF ceramic caps at each power pin, But how these values are calculated?? How many caps we need use in parallel? Can anyone explain it with example of any datasheet or any?