74xx orgin

If guess Fairchild was the company that first made the 54/74xx series The 54xx had mil. specs the 74xx had consumer specs. The first generation was SSI (Small Scale Intergration) like gates and flipflops, Later came MSI, like decoders, adders, counters, and even Alu's (74181) Over time the series also came in a variety of technologies: 74xx (Regular TTL) 74Hxx (High Power ... faster but consumed a lot of amps) 74Lxx (Low power but slow... and not very low-power by todays norm) 74LSxx (Low power Scotty ... propably the best! ) Subsequently followed up by the "modern" CMOS types like 74HCTxx or 74ALSxx etc They were "second sourced" by companies like National Semiconductor, Motorola, Texas Instruments, Siemens, Signetics et al. Before that DTL was in vogue, like the 90xx and 93xx series And even before that RTL was the buzzword. Sipke de Wal --------------------------------------------------- http://xgistor.ath.cx --------------------------------------------------- ----- Original Message ----- From: Hans Franke <Hans.Franke(a)mch20.sbs.de> To: <classiccmp(a)classiccmp.org> Sent: Tuesday, May 15, 2001 1:45 PM Subject: 74xx orgin