Newsgroups: sci.electronics
Path: utzoo!henry
From: henry@zoo.toronto.edu (Henry Spencer)
Subject: Re: cheap hi-speed oscillator
Message-ID: <1990Nov13.172041.490@zoo.toronto.edu>
Organization: U of Toronto Zoology
References: <35596@nigel.ee.udel.edu> <3978@amc-gw.amc.com>
Date: Tue, 13 Nov 90 17:20:41 GMT

In article <3978@amc-gw.amc.com> richm@the-end.amc.com (Rich Moran) writes:
>Try a 74S124.  It's a dual voltage-controlled oscillator.  Typical Fmax is
>85MHz, according to the TI data book.

NO!  NO!  NO!  The S124 is worthless junk!  I speak from experience.

If you must use a 7400-series part, look for (I think) 74S624.  That's a
version that's been fixed to work.  I don't swear to the part number, as
my references are at home and it's been a while.

The part you want for fairly high-frequency VCOs, actually, is the MC4024.
Beware, this is not a CMOS part, it is a TTL part with an odd number; the
Motorola part number for the CMOS part that others would call "4024" is
MC14024.  You can often find the MC4024 in the "odds and ends" sections
of catalogs.
-- 
"I don't *want* to be normal!"         | Henry Spencer at U of Toronto Zoology
"Not to worry."                        |  henry@zoo.toronto.edu   utzoo!henry