Subject: RE: [IBIS-Users] 5V tolerant pad
From: Frank Dunlap (fdunlap@netlogicmicro.com)
Date: Wed Jan 29 2003 - 17:05:46 PST
Just a clarification: a 5-volt tolerant I/O may not necessarily
use a 5V supply. There may not be a 5V supply, and thus, there
may not be an ESD diode to a 5V supply.
Regards,
Frank
-----Original Message-----
From: Muranyi, Arpad [mailto:arpad.muranyi@intel.com]
Sent: Wednesday, January 29, 2003 2:56 PM
To: ibis-users@server.eda.org
Subject: RE: [IBIS-Users] 5V tolerant pad
Garry,
You don't need to use the [Model Selector] for that. The 5V safe feature
usually comes from the clamp diode (and/or the ESD circuit) being connected
to 5V while the pullup is at 3.3 V. This can be modeled with the
[*** Reference] keywords which basically define which rail the IV curve
is connected to.
Arpad Muranyi
Intel Corporation
=========================================================================
-----Original Message-----
From: Aubrey_Sparkman@dell.com [mailto:Aubrey_Sparkman@dell.com]
Sent: Tuesday, January 28, 2003 9:50 AM
To: garry.felker@conexant.com; ibis-users@eda.org
Subject: RE: [IBIS-Users] 5V tollerant pad
Answer is yes. Use the Model Selector switch. But do you need to?
I thought 5V tolerant meant that the input of a chip with 3.3Vcc would not
be damaged by a 5 volt signal.
Aubrey Sparkman
Signal Integrity
Aubrey_Sparkman@Dell.com
(512) 723-3592
> -----Original Message-----
> From: garry.felker@conexant.com [mailto:garry.felker@conexant.com]
> Sent: Tuesday, January 28, 2003 10:52 AM
> To: ibis-users@eda.org
> Subject: [IBIS-Users] 5V tollerant pad
>
>
> Hi all,
> I have a 3.3V I/O pad that is 5V tollerant. I would like to
> include Rising
> and Falling waveform data with voltage rails at 3.6 and 5.5 V.
> Is there a way to include both of these conditions in the IBIS model?
> Garry Felker
>
>
>
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