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From: mjj@aplvax.UUCP (Marshall J. Jose)
Newsgroups: sci.electronics
Subject: Re: TTL Questions
Message-ID: <740@aplvax.UUCP>
Date: Thu, 20-Aug-87 13:45:02 EDT
Article-I.D.: aplvax.740
Posted: Thu Aug 20 13:45:02 1987
Date-Received: Sun, 23-Aug-87 22:24:26 EDT
References: <7105@alice.UUCP> <764@sol.ARPA> <128@umich.UUCP> <15370@onfcanim.UUCP>
Reply-To: mjj@aplvax.UUCP (Marshall J. Jose)
Organization: The Johns Hopkins University Applied Physics Laboratory
Lines: 7
Keywords: TTL, pullups

Ok -- Signetics says LS can be tied to Vcc with SHORT wires &
adequate decoupling.  However, 74xx's should be pulled up with
1k to 10k resistors.  But wasn't there ever some issue about
stored charge in the base-emitter junction, where sloppy pullups
could slow gate switching times?  Anyway, sorry I spoke before
thinking...				Marshall Jose
					mjj@aplvax.jhuapl.edu