[IBIS-Users] RE: Tolerant IO cell's Supply voltage range.?

Thanks Michael for the clarifications.

But still i want to know what is the point in providing such big ranges of 
voltage if the cell doesn't work at that voltages. ?
Because for a 5V tolerant cell, maximum it can tolerate 5V. So what is the 
intention of providing the voltage range from -5V to +10V.
Definitely at such high voltages the cell will breakdown.

Is there any use of providing such tables in application ?

The reason for choosing -Vdd and +2Vdd is to take care of short and open 
circuit conditions. But under those conditions , cell will anyway
will not work. So what the whole idea behind it ?

Best Regards,

Sudarshan HN
NXP Semiconductors/CTO /PLT
C-4, Manyata Tech Park, Nagawara
Bangalore-560 045 , India. 
Ph:+91-80-40267073 
Fax: +91-80-4026 7855
seri:sudarsha@inpsblr
E-mail: sudarshan.honnudike@nxp.com








"Mirmak, Michael" <michael.mirmak@intel.com> 
2007-02-14 11:27 PM

To
"Sudarshan Honnudike" <sudarshan.honnudike@nxp.com>
<ibis-users@server.eda.org>
cc

Subject
RE: Tolerant IO cell's Supply voltage range.?
Classification







Sudarshan,
 
You are indeed correct.  For 5 V tolerant buffers, the clamp tables would 
cover a range based on a 5 V supply, to withstand any incoming 
high-voltage signals.  The [Pullup] and/or [Pulldown] tables would cover a 
range based on the 3.3 V supply. 
 
- Michael Mirmak
  Intel Corp.
  Chair, EIA BIS Open Forum

From: Sudarshan Honnudike [mailto:sudarshan.honnudike@nxp.com] 
Sent: Monday, February 12, 2007 21:56
To: ibis-users@server.eda.org; owner-ibis-users@server.eda.org
Subject: Tolerant IO cell's Supply voltage range.?


Hello All, 

I want to know what should be the voltage range for the tolerant cells for 
I-V curves like [Gnd Clamp], [Power Clamp], [Pull up] & [Pull down]. 
I read it from one of the presentation that, say for a 3.3 V functional 5 
V tolerant cell the voltage range is from -5V to +10V.  Do what curves
this range applies ?. I dont think this range has to be applied for [Pull 
u] and [Pull down] curves as these are basically driver characteristics 
and maximum they can operate under 3.3V. So is it only for Clamp curves ? 

Please let me know your answers. 

Best Regards,

Sudarshan HN
NXP Semiconductors/CTO /PLT
C-4, Manyata Tech Park, Nagawara
Bangalore-560 045 , India. 
Ph:+91-80-40267073 
Fax: +91-80-4026 7855
seri:sudarsha@inpsblr
E-mail: sudarshan.honnudike@nxp.com
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