Hi, Thanks for the responses. I have downloaded an eval SI tool (thanks to Giancarlo) and simulated my approximate setup. Some plain ALVC is not doing so good but other specific models for a TI buffer are doing OK. The signal is not driving rail-to-rail but doing more than adequately for SSTL_18 levels. The duty cycle is also coming in better than I expected. Thanks, Jai --- Faraydon Pakbaz <pakbazf@xxxxxxxxxx> wrote: > Jai; > > You can create some behavioral model of IO using a > RLC model. You can then > modify this passive elements to deliver the current > and voltage level > needed and > test it for various terminations. Let me know if you > are interested and I > can send you > some slides to describe it. They run a lot faster > than actual encrypted > SPICE model > and IBIS. Thanks. > > Regards; > > Faraydon(Don) Pakbaz > AE/TS Customer Support Engineering > Email: pakbazf@xxxxxxxxxx > Voice: (802) 769-5638 Tieline: 446-5638 Fax: > (802) 769-5722 > > > > > steve weir > > <weirsi@xxxxxxxxx > > m> > To > Sent by: > jswarrier@xxxxxxxxx, > si-list-bounce@fr > si-list@xxxxxxxxxxxxx > eelists.org > cc > > > > Subject > 02/22/2006 04:13 [SI-LIST] Re: > Can we drive 100Mhz > AM SSTL_18 with > standard ALVC or > other 1.8V > logic > > > Please respond to > > weirsi > > > > > > > > > > > > Jai, at such a low bit rate, I think a well > terminated channel should > work fine. If you can't simulate, build a small > test vehicle. > > Steve. > > At 11:38 PM 2/21/2006, Jai Shanker wrote: > >Hi All, > > > >For a low-cost implementation we are looking to > drive > >SSTL_18 receivers on our chip with standard 1.8V > >single -ended logic for a 100Mhz clock. > > > >I have usually used LVPECL for this type of > >application. > > > >I checked it should be OK to drive 1.8V levels to > the > >SSTL_18 inputs. The remaining question is about the > >speed / drive performance of the standard logic. > > > >Can I use ALVC244 / 245 type of buffers? They have > ~ > >6mA symmetric current drive. > > > >They dont spec any fMAX or Max data rate info. > There > >is such info on some TI devices (SN74AVC8T245, > > >170Mbps @ 1.8V operation) but they spec a load of > >15pF+ 2K. The ALVC buffer specs its load at > 30pF+500 > >ohms. So would they be comparable. > > > >I have downloaded some IBIS models of the buffers > but > >I dont have easy access to any simulation tool. > > > >Has anybody done this or anything similar. > > > >Thanks for any help, > >Jai Warrier > > > >__________________________________________________ > >Do You Yahoo!? > >Tired of spam? Yahoo! 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Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com ------------------------------------------------------------------ To unsubscribe from si-list: si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field or to administer your membership from a web page, go to: //www.freelists.org/webpage/si-list For help: si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field List FAQ wiki page is located at: http://si-list.org/wiki/wiki.pl?Si-List_FAQ List technical documents are available at: http://www.si-list.org List archives are viewable at: //www.freelists.org/archives/si-list or at our remote archives: http://groups.yahoo.com/group/si-list/messages Old (prior to June 6, 2001) list archives are viewable at: http://www.qsl.net/wb6tpu