NASA used ECL in a 50 Mb Stat Mux back in the Skylab days. The muxes
were in use until about 5 years ago. These muxes had 4 channels and
could be run from 0-48 MB on the channels. These units were large,
about 3 feet tall by 19 inch rack, and there were muffin fan blowers on
both ends - like 12 to an end. They were a pain to troubleshoot, as you
could only power them on, with the cover on - so the blowers would cool it.
Mike Feher wrote:
Well, I designed stuff with ECL back in the late 60's and early 70's. At the
time they were really something as they were the fastest logic around. I
think Sylvania and RCA actually came out with some of the first stuff (in
flat-packs) and then entered Motorola. - Mike
Mike B. Feher, N4FS
89 Arnold Blvd.
Howell, NJ, 07731
732-886-5960
-----Original Message-----
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On
Behalf Of David Forbes
Sent: Tuesday, September 13, 2005 1:25 AM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] 5370A/B Problems
At 7:06 AM +0200 9/13/05, Poul-Henning Kamp wrote:
In message <[EMAIL PROTECTED]>, David Forbes writes:
These EECL chips are indeed odd beasts. No data via Google; not in
the Motorola book from 1980; I'd guess that this is a completely
in-house logic family.
I don't think that conclusion is justified, ECL logic was always
rather special beasts and they were largely superseeded by
CMOS by the time the Internet started.
--
Poul-Henning Kamp | UNIX since Zilog Zeus 3.20
Paul,
I reached that conclusion based on the fact that there is no
manufacturer or part number given for these chips in the 5370B manual
other than HP. The 10K ECL chips in the 5370B parts list are cross
referenced to their Motorola part numbers. The ECL 10K and 100K
series was produced by several companies; this EECL appears to be
unique to HP.
Has anyone on this list ever heard of EECL logic used anywhere
besides HP test equipment? I hadn't heard of it *at all* before
today, and I've been designing high speed digital stuff for over 25
years.
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