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PICList Thread
'[PIC] decouling capacitors for pics'
2009\04\17@083805 by peter green

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I've always used a 100nf or 220nf ceramic accross each pair of power
pins plus a bulk cap (electrolytic or tantalum) somewhere on the board
and things seem to be fine with that (and most designs i've seen online
do the same). But the recent discussion prompted me to check the 452
datasheet where I was surprised to find no mention of decoupling capacitors.

Does anyone know if there are any official microchip reccomendations on
what decoupling capacitors to use with PICs?

2009\04\17@094930 by John Day

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At 08:38 AM 4/17/2009, peter green wrote:
>I've always used a 100nf or 220nf ceramic accross each pair of power
>pins plus a bulk cap (electrolytic or tantalum) somewhere on the board
>and things seem to be fine with that (and most designs i've seen online
>do the same). But the recent discussion prompted me to check the 452
>datasheet where I was surprised to find no mention of decoupling capacitors.
>
>Does anyone know if there are any official microchip reccomendations on
>what decoupling capacitors to use with PICs?

No, and nor do most other micro manufacturers whose products I use.
Specific recommendations are usually reserved for things like
PowerPC's and ARM9's - that sort of size and speed.

At the speeds you are working at generally 100nF on each supply pin
plus a bulk of 22uF and upwards for the chip should be adequate.
Process geometries in the PICs and similar parts are not so small as
to require higher frequency bypassing. On things like FPGA's which
have smaller process geometries but operate at similar clock speeds
you would probably need to add a couple of 1nF to each rail (remember
usually multiple rails) close to the chip.

John

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