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From: crandell@ut-sally.UUCP (Jim Crandell)
Newsgroups: net.micro
Subject: Re: 74S124 as xtal osc - (nf)
Message-ID: <2764@ut-sally.UUCP>
Date: Wed, 18-Jul-84 19:48:27 EDT
Article-I.D.: ut-sally.2764
Posted: Wed Jul 18 19:48:27 1984
Date-Received: Fri, 20-Jul-84 03:50:01 EDT
References: <3754@fortune.UUCP>, <118@bragvax.UUCP> <4062@utzoo.UUCP>
Organization: U. Texas CS Dept., Austin, Texas
Lines: 16

I've seen 2-inverter crystal oscillators in scads of commercial
products (usually with a 74LS04) and I've used them myself.  They
ordinarily work fine, and if you can't make them start, then you've
probably selected the wrong resistor values, or else the crystal
has an effective series resistance which is too high.  I don't know if
they're reliable over -55 - 125, but then 74 isn't spec'ed for that,
anyway.  I've had excellent results with single-inverter CMOS
oscillators, too (CAVEAT -- different resonance mode!).  A section
of a CD4049 works well, and another section will drive a standard
74-series input; 4069/74C04 won't!
-- 

    Jim Crandell, C. S. Dept., The University of Texas at Austin
               {ihnp4,seismo,ctvax}!ut-sally!crandell