Re: [SI-LIST] : Input switching threshold & CPCI

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From: Matt (boomer) Russell (boomer@lsil.com)
Date: Thu Jan 06 2000 - 11:36:57 PST


Doesn't the 5V spec also have a clamp requirement?
It is just a clamp to 5V.

Just curious about how many preople have seen high side
ringing problems with 5V tolerant universal buffers in
a 5V system becuase it drives to 3.3 but the bus clamps at 5V.

matt

>
> If it has a way to not clamp to 3.3V on a 5V bus, AND to clamp to 3.3V on a
> 3.3V bus, then it's OK, and I guess it should have TWO different IBIS spec
> sheets covering the two cases.
>
> But if it is simply 5V-tolerant, all the time, then it can't be used on a
> 3.3V bus. I thought that was the case with this part (with its VCC5REF pin
> ... unless that pin is part of an adjustable clamp and is connected to the
> PCI bus's +Vi/o pins).
>
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