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From: John Popelish
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X-Mailer: Mozilla 4.7 [en] (Win98; U)
Subject: Re: Bypass capacitor position
Date: Sun, 27 Oct 2002 18:20:20 GMT
NNTP-Posting-Date: Sun, 27 Oct 2002 13:20:20 EST
Leon Heller wrote:
> Thanks, John.
> I've updated the PCB layouts with what I think you mean for the grided
> layout, deleted A, and changed the new A in line with your recommendation
> for the tracks - removing the stubs. I'll tidy up the others later.
> I'll also add an example of Bevan's SM capacitor suggestion, on the next
Here is the link for those following:
If A implies that Vcc is routed at right angles to ground, then the
ground trace should pass to the right of the chip.
Improve B by sliding the cap up to put its top pad inline with the
chip. and route the ground trace down the middle of the chip. I would
probably put the cap at the ground end of the chip and run Vcc down
the middle of the chip, instead, for reasons of non symmetrical logic
thresholds discussed earlier. This would be my choice of A through D
As to the gridded version:
Move the caps to the ground end of the chip and slide them down to put
the bottom pad in line with ground pin. Run the horizontal Vcc and
ground traces down the center of the chips, with a little kink to pass
through the pads as needed. Use the cap pads as the feed through to
tie the vertical and horizontal power traces together. Perhaps all
this causes some problem that I am not visualizing.
Onward and upward.
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