74xx orgin

From: ajp166 <ajp166_at_bellatlantic.net>
Date: Tue May 15 19:33:34 2001

From: Sellam Ismail <foo_at_siconic.com>
>I think you guys are going to have to use DTL. If TTL was even around
in
>1970, it was probably pretty expensive at first.


It existed in 1970. By 1973 it was widely used. My Yasu Freq counter
(good to 350mhz) was purchased in 73 and contains:

    7490 decade counter (usually good to 35mhz then)
    7475 quad latch
    7441 Decimal decoder and Nixi driver.
    7400
    7404

74Sxx parts were a year or two later.

Allison
Received on Tue May 15 2001 - 19:33:34 BST