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

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From: Ingraham, Andrew (Andrew.Ingraham@compaq.com)
Date: Thu Jan 06 2000 - 12:56:07 PST


Adding to what D. C. Sessions already wrote....

>Doesn't the 5V spec also have a clamp requirement?
>It is just a clamp to 5V.
 
No, the "high" clamp is optional in the 5V spec. Only the clamp below
ground is required.

>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.
 
Whether the clamp is there or not, ringing can happen that never hits the
clamp.

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