| T.R | Title | User | Personal
Name | Date | Lines |
|---|
| 484.2 | | ANT::JANZEN | Tom LMO2/O23 279-5421 | Wed Aug 27 1986 12:27 | 1 |
| They probably cost about $1
|
| 484.3 | | STAR::MALIK | Karl Malik | Wed Aug 27 1986 13:00 | 8 |
|
Thanks, Tom. I don't think they're bad, just inappropriate.
The company screwed up on a batch of Chromas (mine included)
and used L138's instead of LS (or SL, whatever you said). This
may or may not account for my MIDI boxes not functioning. Worth
a try.
- Karl
|
| 484.5 | Analog is not dead, it's just sleeping. | JON::ROSS | | Wed Aug 27 1986 13:39 | 17 |
|
We now know our resident ecl-maniac hardware type. They love
speed.
You got it on the L-series: L for sLow. Seems like a mistake
in general. When I designed 'stuff' at ARP, LS was a prefered
technology (if you couldnt use cheep CMOS). The CHROMA was
designed by a fellow Ex-Arpist, Paul Derocco, between the time
I left and CBS bought ARP, so I dont know alot about the
instrument other than Derocco's design style. Ocasionally one
would use an "L" series part on purpose to s-l-o-w some signals
down, but I doubt Paul would stoop to that.
Second Active Electronics for a wide variety of parts at GOOD
prices. Go there just to browse sometime...
|
| 484.6 | calling Mr. ECL | APOLLO::DEHAHN | | Wed Aug 27 1986 13:56 | 7 |
|
I don't remember 74Hxxx, but 74HCxxx is High speed CMOS TTL, if
that's what you mean.
CdH
|
| 484.7 | Noteriety where it is due... | DECEAT::AURENZ | Scot Aurenz, ACO/e45, 232-2277 | Wed Aug 27 1986 14:24 | 19 |
|
Re: .4
>...74LSnnn is low-power Schottky (remember the elitist (actually, there
>are better -ist words for him) who put his sperm
>in a bank, he's invented more semiconductor devices than anyone else, I guess).
Tom -
Good review of logic families, but in this paragraph
you mean SHOCKLEY, not Shottkey. Shockley was one of
the developers of the semiconductor diode and the transistor.
You are right, though, that he is one of the biggest jerks
ever to do something significant. (Since this is a music
notesfile, perhaps we could lump him in with Wagner...)
I don't know who Mr. Shottkey is, but I hope he has a
more reasonable outlook...
Scot
|
| 484.10 | "H" means Hungry | CLOVAX::RATASKI | Tom Rataski | Wed Aug 27 1986 14:33 | 9 |
| The 74Hxxx was another mistake which came out about the same time
ar the 74Lxxx parts did. The "H" means High speed (which means faster
than the standard part [74xxx]. It had a few drawbacks - namely
"H" also stood for Hungry - drew lotsa power and it had a very low
fanout. In the end it was an interim part like the "L" part and
has mostly been abandoned for the "LS" type.
Fanout = the number of TTL loads that the output of one of these
critters could drive.
|
| 484.11 | Don't You *DARE* Couple to my Emitter | ERLANG::FEHSKENS | | Wed Aug 27 1986 14:55 | 11 |
| Sorry Scot, Tom's right, the S in S and LS stands for Schottky.
He's the guy who figured out that by clamping things you could
get higher speed. This has nothing to do with Schockly, one of
the guys who invented/discovered the transistor. Also the L in
LS and L stands for Low power, not sLow, although a usual consequence
of low power consumption is low speed.
Didn't Francis Schottky write the Star Spangled Bandanna? ;^)
len.
|
| 484.12 | Why Say It Again? | ERLANG::FEHSKENS | | Wed Aug 27 1986 15:00 | 5 |
| Oops - already all been said. I should read all replies before
replying.
len.
|
| 484.14 | | APOLLO::DEHAHN | | Thu Aug 28 1986 11:50 | 10 |
|
Thanks for the clarification.
One of the reasons 74 and 74L parts aren't around much anymore is
that they're gold-doped, which is expensive to produce and is fairly
unreliable compared to Shottky devices.
CdH
|