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Article #7700Address decoders continued...
From: dale chayes
Date: Wed, 10 Oct 1990 21:48
Date: Wed, 10 Oct 1990 21:48
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1332 bytes
An 8-bit decoder based on a '688 requires three "chips", the 688, a (half of a) package of pull-up resistors and the dip switch. If you don't need the user selectablility of the dip switches and have already made the leap to programable logic, you can do a single chip solution with almost any PAL. I prefer GALs (Generic Array Logic) myself mostly because of the easy re-programming (I never seem to have time to get it right the first time, but usualy have time to get it right eventually.) A nice feature of the GAL(PAL) solution, is that you have lots of flexibility about signal polarity and you can clock it if that is appropriate. Dale -- Dale Chayes Lamont-Doherty Geological Observatory of Columbia University Route 9W, Palisades, N.Y. 10964 dale@lamont.ldgo.columbia.edu voice: (914) 359-2900 extension 434 fax: (914) 359-6817
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Path: arc1-ca.pugleaf.net!utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!sdd.hp.com!zaphod.mps.ohio-state.edu!swrinde!ucsd!pacbell.com!att!iuvax!rutgers!cunixf.cc.columbia.edu!lamont!dale From: dale@lamont.ldgo.columbia.edu (dale chayes) Newsgroups: sci.electronics Subject: Address decoders continued... Keywords: decoders Message-ID: <2848@lamont.ldgo.columbia.edu> Date: 10 Oct 90 21:48:42 GMT Organization: Lamont-Doherty Geological Observatory N.Y. Lines: 19