Re: [SI-LIST] : Connector pin pwr/gnd ratio

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From: Doug McKean (dmckean@corp.auspex.com)
Date: Mon Nov 13 2000 - 14:31:31 PST


"Peterson, James F (FL51)" wrote:
>
> The original question was meant to be:
>
> On my board (CMOS logic), I have 85 connector pins allotted for 3.3v, 2.5v
> and gnd.
> How would you distribute? and why?
>
> Would you do 25% for 3.3v, 25% for 2.5v, and 50% for gnd? (which is a
> component approach, but maybe not a board approach.)
>
> Would you minimize the pwr pins and maximize the gnd pins? if so, why?
> (don't we have return currents flowing in both.)
>
> all inputs and opinions are welcome and appreciated.

Personally? I'd maximize gnd pins.
Reason? To create a sort of quasi
gnd shielding effect within the
connector. Let me illustrate ...

G = ground pin
P = power pin (doesn't matter if it's 3.3, 2.5, 5, ...)

  G G G G G G
    P G P G P
  G G G G G G

Ideal configuration of course ...

Regards, Doug McKean

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