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. -- --David Forbes, Tucson, AZ http://www.cathodecorner.com/ _______________________________________________ time-nuts mailing list [email protected] https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts _______________________________________________ time-nuts mailing list [email protected] https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
