Subject: Re: [IBIS-Users] FW: Modelling an open drain driver
From: Ross, Bob (bob_ross@mentorg.com)
Date: Fri Nov 22 2002 - 17:29:17 PST
Andy:
As a correction to the last statement, only V_fixture voltages
at around Vcc or above make sense for Open_drain models. There
should be no switching action when V_fixture = 0.
Bob Ross
Mentor Graphics
"Ingraham, Andrew" wrote:
>
> I wrote:
>
> > For R_fixture, using 60 ohms in parallel with Rpullup, would come
> > closer
> > to the actual circuit. Unless you intended for Rpullup to be on the
> > far
> > (receiver) end of the 60 ohm trace.
>
> I forgot to say ... you should have a waveform with V_fixture = 0V and
> another with V_fixture = Vpullup.
>
> Andy
>
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