[SI-LIST] Re: Power Supply Distribution/Filtering/Decoupling Guide]
- From: Vinu Arumugham <vinu@xxxxxxxxx>
- To: arpad.muranyi@xxxxxxxxx
- Date: Tue, 13 Jan 2004 15:11:51 -0800
With poor packages, even counting ground pins/balls is tricky. Big
arrays made up of only ground pins/balls in the package corners or under
the die area, are of little use for signal or power quality.
Signals on the package can reference ground, power, both symmetrically
or even switch between the two on the package. So, without looking at
the package layout, one cannot tell which power or ground pins/balls
count ...
Thanks,
Vinu
Muranyi, Arpad wrote:
>You also need to count power pins. Not all
>return paths go through the GND pins...
>
>Arpad Muranyi
>Intel Corporation
>=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
>=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
>
>-----Original Message-----
>From: si-list-bounce@xxxxxxxxxxxxx
>[mailto:si-list-bounce@xxxxxxxxxxxxx]On Behalf Of Hal Murray
>Sent: Tuesday, January 13, 2004 1:20 PM
>To: si-list@xxxxxxxxxxxxx
>Cc: Hal Murray
>Subject: [SI-LIST] Re: Power Supply Distribution/Filtering/Decoupling
>Guide]
>
>
>
>Interesting discussion. Thanks.
>
>
>
>>If there is anything to learn here, it is to take SI and packaging
>>issues seriously in your component selection. Don't just let the
>>system architect or board manager dictate what chip to use simply
>>because it cost a few buck less or have this feature extra. Ask
>>questions, look into data, review their package to make sure it also
>>make sense in SI first. Assert yourself in the selection process. If
>>you think there is not enough signal to ground pin ratio, raise you
>>hand and ask why. ....
>>
>>
>
>Suppose I'm a system/board level designer.
>
>Aside from counting ground pins, is there anything in the data sheet =
>that=20
>will tell me how good a chip will be in this context?
>
>What should I ask the vendor to discover if they have done a good job in =
>this=20
>area? Count the bypass caps on the demo board?
>
>--=20
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