[Premium-Rx] Jim Garland's MECL Chips

[Brian D. Comer]

Frank 
 
As a past Plessey applications engineer 1960's and 1970's I may have the
info you need but there are quite a few books.
 
KF6C G3ZVC Brian
 
 
 
-----Original Message-----
From: premium-rx-bounces at ml.skirrow.org
[mailto:premium-rx-bounces at ml.skirrow.org] On Behalf Of Carcia, Francis
A HS
Sent: Monday, March 28, 2005 1:45 PM
To: premium-rx at ml.skirrow.org
Subject: RE: [Premium-Rx] Jim Garland's MECL Chips
 
    While we are talking about fast logic. I have pretty good Motorola
information but my
    Plessey prescaler book has evaporated. I could use a copy of it or a
site to visit.
    Anybody out there know where to search. fc
-----Original Message-----
From: Geoff Fors [mailto:wb6nvh at mbay.net]
Sent: Monday, March 28, 2005 2:45 PM
To: premium-rx at ml.skirrow.org
Subject: [Premium-Rx] Jim Garland's MECL Chips
Jim,
 
All those Motorola MECL II chips are in the 1968 Motorola "Integrated
Circuit Data Book."
I can make you copies of the data pages on each of them if you wish, but
contact me off-list about that.  They are clocks and gates and
flip-flops as you surmised.  I don't have the spare time to scan and
process them as digital files, but I can photocopy them.
 
These chips were truly state of the art in the late 1960's but vanished
when TTL became the norm.  It's amazing how hard it is to find data on
them these days!
 
As I recall these early MC- prefixed devices are RTL and MECL use a 3
volt VCC so you can't just swap some common TTL chip and expect it to
work.  
 
Normally, troubleshooting something like this would involve a handful of
good chips, a bugtrap, maybe a scope and a Huntron Tracker, and a logic
probe, but you don't have the luxury of known good chips and I don't
think the Bugtraps work on MECL or RTL.  Oh yes, by the way, don't
forget to check for shorted electrolytics and tantalum match-head style
capacitors.
 
This topic points out some of the difficulties intelligence agencies
faced when trying to reverse engineer pieces of equipment captured from
"enemy " nations.   Today, everything is full of Motorola, Intel or
other western name brand chips!
 
Geoff Fors  
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