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Article #17991

Re: TTL Questions

#17991
From: Stephen King
Date: Tue, 25 Aug 1987 12:29
22 lines
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<munch>


I have been designing and building TTL circuits for some time and
I have never experienced any problem with LS, S, ALS, F series
parts with inputs tied high/low WITHOUT resistors. I always
distribute a lot of capacitance around my circuits, so VCC is
not noisy, and with proper power supplies never will be. For
the sake of argument, I scanned some of the schematics I have
for multibus cards built by a prominent manufacturer (who shall
remain nameless). In NO instance does this manufacturer uses pull-
ups. All sorts of things are tied high/low in all sorts of circuits.
I looked at CPU cards, memory boards, video cards, frame grabbers, the
works. These items have functioned flawlessly for about three years
now, as have many of my circuits (the remainder have simply fallen into
disuse). So, there's my $0.02 worth. .......................sjk


-- 
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Path: arc1-ca.pugleaf.net!utzoo!dciem!king
From: king@dciem.UUCP (Stephen King)
Newsgroups: sci.electronics
Subject: Re: TTL Questions
Message-ID: <2405@dciem.UUCP>
Date: Tue, 25-Aug-87 08:29:33 EDT
Article-I.D.: dciem.2405
Posted: Tue Aug 25 08:29:33 1987
Date-Received: Thu, 27-Aug-87 04:44:56 EDT
References: <7105@alice.UUCP> <764@sol.ARPA> <128@umich.UUCP> <15370@onfcanim.UUCP> <739@aplvax.UUCP>
Reply-To: king@dciem.UUCP (Stephen King)
Organization: D.C.I.E.M., Toronto, Canada
Lines: 22
Keywords: TTL, pullups