9 Dec
2007
9 Dec
'07
12:35 p.m.
Christian Corti wrote:
On Sat, 8 Dec 2007, Brent Hilpert wrote:
Well, that makes sense to some degree, the 740 numbers conceivably following
on the 730 RTL numbers, but I have never seen or heard as you suggest.
It sounds a little more like a convolution of TI's developments. The
1965 catalog (which appears to be a full-line catalog) declares the 5400
series as new, it includes earlier/older IC series, and makes no mention of
either 740 or 7400 numbers or series. The implication from this catalog is
that TI went to the 4-digit numbers with the original and initial release
of the 5400 series. All the mentioned 5400 numbers end in 0.
A 1969 TI 54/74 series TTL databook makes no mention of 3-digit 740 numbers
in the cross-refs, although it does mention another TTL series with some 3-digit
numbers (SNG1xx,SNG2xx,SNF1xx,SNF2xx). If you find your databook I'd be
interested in hearing details.
The earliest reference for real ICs I have is a
TI product catalog from
1965. The first products mentioned are the "NEW! Series 54 TTL"
(SN5400,5410,5420..5470) (4.5 to 5.5V of course). The commercial 74xx
versions apparently followed a little later.
There are earlier ones. As you might know, the SN74xx family started with
the SN740, SN741 etc. (only three digits!). After TI expanded this family
they went over to four digit part numbers and just appended a zero to the
already available parts. Thus the SN740 became the SN7400, the SN741 the
SN7410 and so on. I have a TI databook somewhere that has the old part
numbers.