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From: heiss@spp2.UUCP
Newsgroups: net.lsi,net.wanted
Subject: Re: HELP!  What are these chips?
Message-ID: <251@spp2.UUCP>
Date: Mon, 12-Nov-84 01:11:45 EST
Article-I.D.: spp2.251
Posted: Mon Nov 12 01:11:45 1984
Date-Received: Tue, 13-Nov-84 05:52:09 EST
References: <357@mako.UUCP> <1636@wateng.UUCP>
Organization: TRW, Redondo Beach  CA
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Xref: dcdwest net.lsi:35 net.wanted:3069

> >Some time ago, I purchased a "grab bag" of TTL chips from a Radio Shack store
> >in Cambridge, England.  Most of them were easily identified, but a few have
> >me stumped.  I've checked both the "official" books and the D.A.T.A. books
> >in the digital, interface and memory catagories.  I would just chuck them,
> >but I've got at least a dozen of each type, so they might be useful.  Anybody
> >know anything about these gems?
> >	74117, 74118			{ 14 pins
> >	239 2106   TB 759933   7202 P	{ all of these are TI trademarked,
> >	239 2107   TB 759933   7222 P	{ have 14 pins, and are marked:
> >	239 2111   TB 760432   7239 P	{ "UK MADE".  Probably ROMs?
> >	239 2115   TB 760532   7144 P	{
> >	MC14495P			{ Motorola TM, 16 pins
> >	74119				{ 24 pins
> >-- 
> >:::::: Jan Steinman		Box 1000, MS 61-161	(w)503/685-2843 ::::::
> >:::::: tektronix!tekecs!jans	Wilsonville, OR 97070	(h)503/657-7703 ::::::
> 
> I propose a little contest, for all you hardware freaks out there.  Suppose we
> just sit down, and try and recall/imagine what the beasties are.  Post your
> answers, and then go look them up.  I will tally the best guesses/answers,
> and reward the winner with a suitable Negotiable Prize.  No "skill testing"
> for this one.
> 
> My contributions?  Lessee-  74117, 74118- some sort of drivers, I think for
> high speed lines. The 2106/2107 are OOOOLLLLLD MOS rams, and should be classed
> as "antiques".  Save these, and crack them open, and put them on display
> next to a current 64K ram...  2111 and 2115 I think are rams also.
> 
> MC14495 is a CMOS gate, uuhhh, I think it just might be a phase locked loop.
> Is the 74119 an 8x8 RAM?
> 
> Patrick ("I got a crate full here, anybody want more?") Powell

My contributions - let's see, no peeking in the data books now -

74117, 74118 - JK flip-flops

2107, 2111, 2115 - If the manufacturer were Intel these numbers would
		   indicate MOS RAMs, but those RAMs all need >14 pins 
		   (remember 22 pin DIPs?) With all those digits I think
		   you have "house numbered", i.e. non-standard designations.
		   First guess: core memory drivers (maybe 72XX)
		   Second guess: DTL logic

MC14495 - Motorola's fabulous CMOS latch-seven-segment-decoder-driver

Is the 74119 a 16 bit shift register?

On cracking open chips: the ceramic-sandwich packages are easily split
with old diagonal cutters, but what about the plastic packages?  What tool
or chemical will expose the silicon for viewing?

	-Robert  ...!{ucbvax,decvax,ihnp4}!trwrb!trwspp!spp2