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Decoupling capacitors

Main purpose is to act as temporary charge reservoirs, guarding against voltage droop.

Also serve as a path for high speed return current to jump from Vcc to Gnd (remember, to an AC signal, both Vcc and Gnd are AC gnd).

Use 10 - 100 uF for bulk decoupling.

Use 0.01 - 0.1 uF at each power pin (determined by switching frequencies used in design).

Select a voltage rating higher than Vcc.

Don’t go overboard with too many caps, it will increase cost and decrease available board area.  

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