Re: [SI-LIST] : OVERSHOOT/MAX. VOLTAGE RATING

Matt (boomer@lsil.com)
Wed, 21 Jul 1999 16:14:12 -0500

hi,

The problem, at least for ASIC vendors, is that I don't know all the
circuits that you are going to have on the chip and so we have to assume
that something in the chip won't like high frequency noise coupled onto
the power rails.

Even if the IO rails are issolated from the core supplies (something
that is not really possible for a common ground substrate) That noise
could also get coupled through the package.

That is why alot of times all that you see is the DC max level which
is essentialy the limit for not turning on the clamp diodes.

This is a limit that I have been struggling with so any comments on
how to look at this would be appreciated.

matt

Scott McMorrow wrote:
>
> Jim,
>
> Jim_Pankratz@Dell.com wrote:
>
> >
> > Why do we not see Maximum AC Operating Conditions in current data sheets?
> >
> >
>
> This is a good question. It would be nice to have some sort of
> maximum energy over a particular voltage, since the problem is
> a time/voltage(current) phenonemon.
>
> It would also be nice to have a decent way of specifying the
> sensitivity of an input to high frequency energy such as noise
> and glitches in the threshold region. The Pentium Pro/PII/PIII
> specs from Intel take a stab at this. The spec, however, is
> a bit kludgey.
>
> regards,
>
> scott
>
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