RE: [SI-LIST] : Some Semiconductors are Unnecessarily Fast

Ingraham, Andrew (Andrew.Ingraham@compaq.com)
Tue, 13 Jul 1999 13:25:49 -0400

>What we are seeing are a number of instances where the semiconductor
companies
>are producing parts with edge rates way faster than the clock and
application
>calls for. Parts with 500ps rise times or less and clock periods of 100ns
or
>more.

I see it happen too with board designers who choose the wrong jelly-bean
(SSI/MSI) parts for the design. Signals need to be classified according to
criteria including speed, before selecting appropriate components. Too
often I've seen parts used that are known to be problematic when driving
more than a couple of inches, being used to drive long traces with
asynchronous, sub-MHz signals.

Regards,
Andy Ingraham

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