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From: whit@milton.u.washington.edu (John Whitmore)
Newsgroups: sci.electronics,rec.radio.amateur.misc
Subject: Re: help in looking up some chip functions
Message-ID: <1991Apr23.005410.18436@milton.u.washington.edu>
Date: 23 Apr 91 00:54:10 GMT
References: <1991Apr20.043133.2010@world.std.com>
Distribution: na
Organization: University of Washington, Seattle
Lines: 30

In article <1991Apr20.043133.2010@world.std.com> digex@world.std.com (doug e humphrey) writes:
>Here is a request for help; I have found a bunch of rails of *old*
>chips kicking around. 

>SP 616       SP 659
>SP 620       SP 680
>SP 670       SP 663
>SP 677       SP 662
>MC 668       MC 672
>MC 665       MC 678
>MC 666       MC 679

	I'm not certain about the 'SP'-prefix parts, but the others
are a species of TTL called 'HNIL', for High Noise-Immunity Logic.
They're intended for control circuitry in very (electrically) noisy
environments, having 5V logic range; mainly these were superseded by
the early CMOS.  This sort of component is likely 20 years old,
and they originally sold for circa $2 each.
	MC668     quad 2-input gate with pullup resistors
	MC672     quad 2-input gate with active pullup
	MC665     HNIL/saturated logic triple level translator
	MC678     Hex inverter (open collector) with strobe
        MC666     saturated/HNIL triple level translator
	MC679     dual lamp driver

	The 'SN2xxxx' part numbers are Texas Instruments numbers,
but I don't recognize 'em.  They aren't op amps, 'cuz op amps were
numbered 'SN72xxx'.

	John Whitmore