[time-nuts] 5370A/B Problems
kirbybq at bellsouth.net
Tue Sep 13 12:57:10 EDT 2005
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
>From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] 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@example.com>, 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
>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
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