[time-nuts] 5370A/B Problems

Mike Feher mfeher at eozinc.com
Tue Sep 13 08:07:31 EDT 2005

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

-----Original Message-----
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 <a06230901bf4bedd49e4d@[]>, 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 


--David Forbes, Tucson, AZ

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