Fabio: I will add that the IBIS format for series switch models documents the allowed states shown in you logic block diagram so that D connects either through S1 or through S2. [Series Pin Mapping] will allow documentation of all connection possibilities (with the function_table_group column for designating those combinations which are in sync. with each other. [Series Switch Groups] then captures the allowed cases for the specific device. In your case D through S1 or D though S2 could be documented as two different states that are supported in the IBIS model. In general, all cases allowed by the other logic could be documented. These include no through paths and both S1 and S2 connected to D. So the series switch model (with [Series MOSFET]) provides full electrical and configurability information for the multiplexer. An input clamp at D can even be added. However, you should not use the standard IBIS buffer I-V/V-T methodology. Bob Tom Dagostino wrote: > Fabio > > This is definitely a case where the series model is the appropriate > solution. > > Tom Dagostino > Teraspeed(R) Labs > 13610 SW Harness Lane > Beaverton, OR 97008 > 503-430-1065 > tom@teraspeed.com > www.teraspeed.com > > Teraspeed Consulting Group LLC > 121 North River Drive > Narragansett, RI 02882 > 401-284-1827 > > -----Original Message----- > From: owner-ibis@server.eda.org [mailto:owner-ibis@server.eda.org]On > Behalf Of Fabio BRINA > Sent: Thursday, April 27, 2006 4:06 AM > To: ibis-users; ibis > Subject: [IBIS] [IBIS-Users] pass-trans curves > > > > Hi IBIS expert, > > I have to modelling a multiplexer with only > one input D and two output S1, S2. > the equivalent circuit is in the attachments. > ( note that between D and S1 there is no buffer > structure , but only a pass-transistor, the same > between D and S2 ). > > I have characterized EN, D , S1 , S2 as input model type > (only clamp curves) and S1 S2 are characterized > through [series Mosfet]. > Is this a correct and complete characterization ? > > if you think that S1 and S2 have to been associate to > output model type, in which way I can extract pullup > , pulldown , rising , falling curves, if I haven't got a typical > cmos structure as in this case? > > I hope that my exposition is clear! > > thanks, > Fabio > > -- Bob Ross Teraspeed Consulting Group LLC Teraspeed Labs 121 North River Drive 13610 SW Harness Lane Narragansett, RI 02882 Beaverton, OR 97008 401-284-1827 503-430-1065 http://www.teraspeed.com 503-246-8048 Direct bob@teraspeed.com Teraspeed is a registered service mark of Teraspeed Consulting Group LLC ----------------------------------------------------------------- |For help or to subscribe/unsubscribe, email majordomo@eda.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 email a request to ibis-request@eda.org. | |IBIS reflector archives exist under: | | http://www.eda.org/pub/ibis/email_archive/ Recent | http://www.eda.org/pub/ibis/users_archive/ Recent | http://www.eda.org/pub/ibis/email/ E-mail since 1993Received on Thu Apr 27 13:09:53 2006
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