nyef wrote:
Oh, nice. Max prop times on a '00 less than half of a 74F. Now if only we could get a '138 in ABT...
Hmmm, the figures (below) for the CY74FCT138 are about half of those for 74F.
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Notice with this particular product there's a suffix that denotes different speed grades, with "C" being the fastest. Of course package options and availability are two potential show-stoppers for the hobbyist, but I'm glad to see that Mouser presently has the A version in stock in SOIC, offered in single-unit quantities.
BigEd wrote:
it would be good to have a sticky thread summarising the strengths and weaknesses of the various 74 series families
Perhaps that'd be helpful, but let me remind everyone that
the filtered part searches offered by major suppliers on their web sites are an excellent way to find the best part for your needs. You just apply successively finer filters, filtering for the attributes you deem most important first.
The advantage of the filtered part search is
it allows you to find options you were unaware of, or had perhaps forgotten. It lets you express the
goal.
In this case, the goal isn't to find an ABT or FCT or whatever. The goal I sought was a fast, 138-type decoder that'll run on 5 volts. The logic family was determined last -- not first.
Although there are other good examples, it's the DigiKey site I use most. From their main page, go to Product Index (
not Catalog).
cheers,
Jeff
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In 1988 my 65C02 got six new registers and 44 new full-speed instructions!
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