Richard

I realize that you are not directly asking for this information in this thread, but if you are interested I have the following documents on Motorola ECL in pdf format that may be the answer to your original question:

MECL Device Databook (2nd edition 1986) (actually a European edition.)

AN-579; Testing MECL 10,000 Integrated Logic Circuits
AN-581; An MSI 500 MHz Frequency Counter Using MECL And MTTL
AN-701; Understanding MECL 10,000 DC and AC Data Sheet Specifications
AN-720; Interfacing With MECL 10,000 Integrated Circuits
AN-776; The M10800 MECL LSI Processor Family - Three Descriptive Articles

Let me know if you want any.

-Aubrey

Added:
I have also manged to locate copies of
MECL Data dated 1993 (US edition)
ECLinPS Data copyright 1991 (US edition)
and if desired I can scan them as well.