Subject: [IBIS] Re: [IBIS-Users] About Vmeas
From: Stacy L Gore (Stacy_L_Gore@raytheon.com)
Date: Tue Apr 08 2003 - 07:05:50 PDT
Vmeas is the reference voltage level that the manufacturer uses when
specifying
the propagation delay and/or device output switching time. The Cref, Rref
and Vref
subparameters correspond to the test load that the manufacturer uses for
the component.
Example:
If a buffer has a prop delay of 1ns, is measured based on a the time the
input signal is valid
(for a one, when the signal crosses Vih) and the output signal crossed
Vmeas while the device
is loaded with the test circuit as defined in the data book.
Vmeas for a typical TTL output device is 1.5v
Stacy Gore
Raytheon Garland
Lior Aviv
<RM18440@email.sps.m To: ibis@server.eda.org, ibis-users@server.eda.org, ibis-info@server.eda.org
ot.com> cc:
Sent by: Subject: [IBIS-Users] About Vmeas
owner-ibis-users@ser
ver.eda.org
04/08/2003 02:46 AM
Hello,
Recently, I was asked to add the Vmeas parameter to an ibis model i'm
running.
It's definition is not clear at the ibis spec.
[ Reference voltage for timing measurements ] .
Is it the total output voltage the signal should climb to
or just a part of it?
Thanks ahead for your responses
Lior Aviv,
Motorola Semiconductor Israel.
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