RE: [SI-LIST] : Number of GND/Power pins in a connector ?

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From: Fokken, Gregg J. (fokken.gregg@mayo.edu)
Date: Thu Mar 23 2000 - 08:15:37 PST


If you're using CMOS rail-to-rail, your GND connector pins will see
essentially the same switching current that you're PWR pins will see.
However, if your board is well bypassed as you say, then you don't need to
worry about switching current in either PWR or GND pins at the board edge
(only steady-state as you mention).

> -----Original Message-----
> From: Stuart Adams [mailto:sja@brightstareng.com]
> Sent: Thursday, March 23, 2000 9:43 AM
> To: si-list@silab.eng.sun.com
> Subject: [SI-LIST] : Number of GND/Power pins in a connector ?
>
>
>
> How do I calculate the number of ground and power
> pins I need in a board-to-board connector.
>
> The number of grounds is a function of switching
> current and how many signals will switch at the same
> time, correct ?
>
> More grounds is always better but what about power pins ??
>
> If one or two pins are sufficient to carry the max steady
> state current and my board is well bypassed with bulk and
> ceramic caps, is there a need for alot more power pins ?
>
> -- Stuart
>
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