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 -- This message has been scanned for viruses and dangerous content by MailScanner, and is believed to be clean. -- This message has been scanned for viruses and dangerous content by MailScanner, and is believed to be clean. -------------------------------------------------------------------- |For help or to subscribe/unsubscribe, e-mail majordomo@eda-stds.org |with the appropriate command message(s) in the body: | | help | subscribe ibis <optional e-mail address, if different> | subscribe ibis-users <optional e-mail address, if different> | unsubscribe ibis <optional e-mail address, if different> | unsubscribe ibis-users <optional e-mail address, if different> | |or e-mail a request to ibis-request@eda-stds.org. | |IBIS reflector archives exist under: | | http://www.eda-stds.org/pub/ibis/email_archive/ Recent | http://www.eda-stds.org/pub/ibis/users_archive/ Recent | http://www.eda-stds.org/pub/ibis/email/ E-mail since 1993Received on Fri Feb 16 00:22:29 2007
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