Replying to myself here..
On 10 Nov 2007, at 12:31, Michael Meeuwisse wrote:
Do we really want test cases for all of them? How will this fit in
some sort of library? I'll try to write one for the 7442 though.
Done. It's really the opposite of the 74138 example given, so I just
adapted that test case. I don't, however, completely get it. What
does the #2 mean in this line;
#2 in <= in + 1;
We might want to make sure there's a replacement for all of them,
but I'll have a go at it.
Tossed out:
7401 (= 7400)
7403 (= 7400)
7405 (= 7404)
7406 (= 7404)
NOT 7407 - this has (albeit very small) a propagation delay, is it
ever used for that feature?
7409 (= 7408)
7412 (= 7410)
7413, 7414, 7419, schmitt triggers won't work
7415 (= 7411)
7416, 7417 (= 7404)
7422 (= 7420)
7426 (= 7400)
7433, 7436 (= 7427) pinout difference won't matter
7437, 7438, 7439 (= 7400)
7440 (= 7420)
7441 - I couldn't immediately find a datasheet of this one, it's /
that/ obsolete :) assume = 7442
NOT 7443 - again, no datasheet, don't exactly know how much output
pins it has
7446, 7447, 7448, 7449 are all the same, but I don't know if there's
another replacement w/o any "with x" clause so I left 7448 in the list.
And that pretty much concludes my lunchtime so I'll look at the rest
tonight or something.
Mike
www.wacco.mveas.com - Project VGA
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