Re: [SI-LIST] : HSTL voltage levels

Gerald Johnson (jjohnson@minn.teradyne.com)
Wed, 4 Aug 1999 12:32:36 -0500

D.C.

What you say is certainly true if one only worries about DC
noise margin. However, if the offending noise were to be so
impolite as to happen during a series of high speed transitions
such as real data, then it would indeed subtract from the=20
AC levels wouldn't it? Therefore the AC noise margin could be
smaller than the DC noise margin. Seems like both are important.
Different, but both important.

Jerry Johnson
jjohnson@minn.teradyne.com

>=20
> Watch out -- noise margin to the AC numbers is irrelevant. The AC=20
thresholds
> are guaranteed to cause a change of state, but for noise margin you =
only=20
care
> about the DC thresholds; they are the limits of what is guaranteed to =
NOT
> cause a change of state.
>=20
> --=20
> D. C. Sessions
> dc.sessions@vlsi.com

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