On Fri, Oct 27, 2017 at 4:13 PM, Brent Hilpert via cctalk <cctalk@classiccmp.org> wrote: > 74S is faster than 74LS, 74LS was combining low power techniques (which > result in loss of speed) with Schottky technology to get some of the lost > speed back, to get a better speed-power product than 'normal' TTL.
Right. My bad there. > The chronological order of development was 74 --> 74H & L --> 74S --> 74LS I do recall that progression. I've even seen a couple of 74L parts (and there are more than a couple 74H parts in a 1968 PDP-8) -ethan
