Do you have a question? Post it now! No Registration Necessary
- Posted on
- EL8333A Crypto processor
October 21, 2005, 4:58 pm
rate this thread
- Rich Grise, Plainclothes Hippi
October 21, 2005, 11:12 pm
Re: 7400 NAND Gate
Excusez moi??? Your underlying assumption is that the physically higher
voltage is logic '1' and '0' on the physically lower. Do you lack the
brain power to ask yourself why this should be so, because there is
absolutely no reason for it whatsoever. Apparently Motorola did not
agree with you because their ECL databooks were full of those negative
logic tic things only they used. Any physically high input to a NOR
drives the output to physically low, but when you take physically high
as '0' and physically low as '1', that results translates into any
binary '0' input to the ECL NOR takes the output to a binary '1'. Looks
like a NAND to me!
Re: 7400 NAND Gate
"Nand Gate Luver" ( email@example.com) writes:
Circa 1967, maybe.
After all, back then there was a limited selection of logic ICs. If
you needed something better, you often had to construct it from
the few common gate types. Indeed, in the days of RTL there was more
than one article about making your own simple RTL gates, so you'd
start with discrete components and build up from there.
By the time Don Lancaster wrote his "TTL Cookbook", circa 1974, those
equivalents were more about describing how the exotic gates like exclusive-or,
worked, rather than because anybody needed to build one up from a 7400.
- » Laser range finder optoelectronic mixing noise problem
- — Previous thread in » Electronics Design
- » Amateur electronics in danger due to lack of DIP ICs
- — Last Updated thread in » Electronics Design
- » some Dash Lights only go on at Night, can't be seen in the day time.
- — The site's Newest Thread. Posted in » Electronics Repair