Mr Brooks
The old rule of tumb was to set by-passes next to VCC so you did
not have a pwr trace running on top of your board the length of your
IC.
How ever today most boards have planes for pwr, gnd So a even
matrics of bypasses across the board will do the trick.
All you are doing is decoupling vcc,gnd, if done correctly the board
and parts will not make noise.
Hope this helps
DM PAVONE
Micros
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Subject: Placement of bypass caps
Author: [log in to unmask] at SMTPLINK-Micros
Date: 4/4/96 5:45 PM
I have several sources (including the Motorola FACT book) that say bypass
caps should be placed as close as possible to the GROUND pin of the IC (not
the power pin.) But I have seen few really specific discussions of why this
is so.
Some of my customers insist on having them placed as close as possible to
the power pin.
Can anyone give me a definitive explanation of where they should be placed,
and why? Thanks
Doug Brooks