1. MC88920 has been designed specifically for the 20 and 25Mhz 68040 microprocessors.

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Yes, I noticed that when I reviewed the datasheets last week. However, folks seem to run at 20 - 25 MHz even after they've swapped in an 88916. There might be problems if the 88916 gets hot or otherwise loses margin, I imagine.

2. MC88916DW70 will work at max 35 MHz processor frequency and has been designed for faster than 25MHz processors.3. MC88916DW80 will work at max 40 MHz processor frequency and also has been designed for faster than 25MHz processors.

If the manufacturer says what we should use, it would be good engineering practice to follow his recommendations. In our case we all should be using DW80 version, not even DW70!

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The 88916s I have on hand are the '80, but I got mine as samples from Freescale over ten years ago. I wish I had somehow gotten more now, as I only have two. Freescale sent the part to IDT who does not appear to offer it any more, or if they do, they sure don't make it easy to figure out on their web page. Maybe it's a Flash thing.

The easiest place to get the 88916 now, is probably from Marc Schrier. He still lists them for $20 on his Output Enablers website. Assuming that info is still valid, that may be the only remaining source short of ordering 50 of them them Arrow. The problem is that Marc lists the DW70, not the DW80, so while the DW80 would be better, teh DW70 is probably all that is realistically available.

I guess I should go add MC88916* to my list of Ebay searches...