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Looking for guidance on creating/locating IBIS models for SN74 series devices...

Other Parts Discussed in Thread: SN74ACT240, SN74ACT241, SN74AC241

I did some looking around in the TI IBIS zip file and couldn't find the associated IBIS models, so here goes.

SN74ABT241: ADW package

SN74ACT240: DW package

SN74ACT241: DW package

SN74AC241: DW package

I tried using Mentor's Visual IBIS editor, but was cautioned against using it's wizard.  Is there a better way?  or perhaps a repository of files that I don't know about?

While I'm at it, what's the best way to create a model for ASICs?