Re: Indentification of old (1970) logic family?
From: Norm Dresner (ndrez_at_att.net)
Date: 07/05/04
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Date: Mon, 05 Jul 2004 04:42:21 GMT
"mcb, inc." <mcbinc@world.std.com> wrote in message
news:Pine.SGI.4.40.0407042107090.8873054-100000@shell01-g...
>
> Google and friends have been of no help and hoping someone
> can help me identify some devices. I'm doing a bit of reverse-
> engineering on a device that uses a logic family I've never
> encountered and which I can't find. Functions appear to be
> similar to ttl (gates, hex inverters, flipflops). Packages
> are standard 14-, 16-, and 24-pin dip. Manufacture date
> is 1970. Logo is an outlined box with small 's' inside (LSI?).
> Given loads and resister pull-up values, logic can sink quite
> a bit of current. Power supply is a bit outside of standard
> ttl spec (running about 5.6V). Devices I'm trying to track
> down are: TR1001, TR1004, TR1005, TR1006, TR1007, TR1008,
> TR1009, TR1010, TR1011, TR1014, TR1016, and TR1023.
>
> My museum doesn't go back far enough so I'm looking for any
> info. I don't need electrical characteristics, just function
> and pinout. Thanks...
>
The TI TTL databook gives 7V as the absolute maximum supply voltage for a
TTL IC and 5.5V as the maximum input level.
They might be nothing more than common chips with house numbers being
totally abused.
Norm
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