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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?
Hi Ramzi,
SN74ACT244 and SN74ACT245 have IBIS models. They are both Octal bus transcievers with 3-state outputs. Can you see if this model is suitable for your simulations?
The SN74ABT241 is obsolete, so we won't be able to support that device with a model.
Regards,
David
Webench Design Center
I'm kinda new to using BoardSim which is a Mentor product.
From what I gather, a device with a similar package can supply the R, L, C numbers for the pins while a device similar in function can supply the other stuff. So I suppose I'll ask if you believe those two parts you listed are similar enough in function, especially for a low frequency system (16 MHz and lower)...
They share the same package, and basic design. I've cobbled together a model for the ACT241 and attached it to this post. Let's see if I did that correctly.
Looking at the datasheet, the spec's on the VOH/VOL as well as the Tr/Tf suggest that this model should be fine. There's a bit of a difference on the Co capacitance, but at 16 MHz, this won't matter.
David
OK. So you're suggesting that one model is good to use in place of all four part numbers I listed (because the packages are the same)?
The model should be good for the ACT240 and ACT241. The AC240 shows and extended voltage range. The model provided only covers VCC = 5.0.
The ABT241 is obsolete, so I'm not sure if it shares the same circuit architecture or not.
David