decoupling caps placement
- From: "tempus fugit" <toccata@xxxxxxxxxxxxxxxxxxxxxxxxxxx>
- Date: Sun, 21 Dec 2008 16:33:47 -0500
Hey all;
I've got a circuit that uses 3 4049 inverters. On this IC, the V+ is on pin
8 and the ground is on pin 1. I know that the decoupling caps need to be as
close to the IC as possible, but how can I connect 1 end of the cap to V+
and the other to ground when the pins are so far away? Is it sufficient to
connect 1 end of the cap to V+ and the other to a nearby ground node, or
should the cap be connected close to the actual ground pin of the IC? Also,
do I use 1 cap for each IC? If so, (the ICs are fairly close together)
wouldn't the IC "see" the caps as being the paralleled value of the 3 caps,
thus reducing the available capacitance? I was going to use 0.1uF for the
value of each decoupling cap. Would it also be wise to use a larger (1uF or
higher) cap in parallel?
Thanks
.
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