You are right I screwed up there .......
And I was also wrong about the 9xxx series being DTL
But IIRC Fairchild did make the first TTL 9xxx series
as a successor to the 9xx DTL. They did have some
quality problems with their TTL an so TI made the day
cause TI did a better job on quality control.
If you build a small design with say 3 or 5 TTL chips
a dropout of say half a percent will not be a big problem,
but if you have a design with 100+ chips, on average
only half of your products will work after production
the other half going DOA and in need of repair.
Maybe TI let the military pay for their quality control
cause of the rigorous mil. specs and sold the acceptable
parts as commercial, since they would then also be in
the position to cast out the really bad ones. The military
would pay a premium for the rigorously tested material.
and propably paid for the development of the qualitycontrol
system in the first place.
Anyhow TI started using a leading 5-series to signify
mil. specs and a leading 7 for commerical.
Sipke de Wal
-----------------------------
http://xgistor.ath.cx
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----- Original Message -----
From: Pete Turnbull <pete_at_dunnington.u-net.com>
To: <classiccmp_at_classiccmp.org>
Sent: Wednesday, May 16, 2001 12:51 AM
Subject: Re: 74xx orgin
> On May 15, 20:54, Sipke de Wal wrote:
> > If guess Fairchild was the company that first made the 54/74xx series
> > The 54xx had mil. specs the 74xx had consumer specs.
>
> Nope, TI made the first 54/74. Fairchild made other things, some of them
> before TI, but not 54/74 TTL (a least, not before Texas).
>
> --
> Pete Peter Turnbull
> Network Manager
> University of York
Received on Wed May 16 2001 - 12:36:35 BST