15 May
2001
15 May
'01
12:40 p.m.
From: Hans Franke <Hans.Franke(a)mch20.sbs.de>
Sounds close to right. The S however was later the basic 74181
was first. Infact the July 1972 issue of Ham Radio Has a supplier
selling the 74181 for $4.50!!
Allison
Maybe I should specify my question ... I need to know
at what date these chips where at first available -
not just the era. A good single IC to use could be the
74181 ALU.
Around 71. Then the H, S, LS, ALS and F parts.
I have a 74
TTL design guide at home, so I'll check it too.
The oldest datasheet I could find says Dec 1972 for the 74S181 
18 May
18 May
6:01 a.m.
New subject: 74xx orgin - Update
>Maybe I should specify my question ... I need to
know
>at what date these chips where at first available -
>not just the era. A good single IC to use could be the
>74181 ALU.
Around 71. Then the H, S, LS, ALS and F parts.
>> I have a 74 TTL design guide at home, so
I'll check it too.
>The oldest datasheet I could find says Dec 1972 for the 74S181
Sounds close to right. The S however was later the
basic 74181
was first. Infact the July 1972 issue of Ham Radio Has a supplier
selling the 74181 for $4.50!!
Well, that's _pretty_ cheap ... even considering the higher
monetary value back than.
Now, new serches found a 1968 Siemens data book with cross reference
from Siemens numbers to TI numbers (FLH 101 -> 7400
The system was
quite logical and described the basic function) for low scale ICs
(no '181 in this book), and another data book from 1970 with a
reference to the '181 - so if Siemens offers already a cross reference,
the chip must be around at least some time...
Ciao
Hans
--
VCF Europa 3.0 am 27./28. April 2002 in Muenchen
http://www.vcfe.org/
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