John Popelish wrote:
It just occurred to me, I have no idea where either the 7400 series
came from, or where the 700 series of analog numbers came from,
If I recall correctly, the 74xx was Texas Instruments designation for
their commerical-grade TTL. They also had a parallel 54xx sereies for
their MIL-spec parts.
But why did they select 74 and 54 for these purposes? That is
essentially the crux of the original question. I think the answer is
something like that your parents used in selecting your name.
The µA7xx series came from Farichild. Some other memorable members of
this family were the µA702 and µA709 op-amps, µA711 comparator,
µA739 dual preamp, µA747 (dual µA741 in a single package). µA741
was just the next one in the series.
Now, tell me who decided uA7xx would be the series designation and why
they made this choice.