Actually, they really are not. The ECL inputs are just the base to one transistor of a differential pair. So, the inputs actually draw rather little current in the logic high state, and no current in the logic low state. You do need to provide pull-down to the outputs, however, so that the emitter follower is always sourcing a little current.
Jon
That's fine: UCLA didn't pay me much.
-- John Larkin Highland Technology, Inc picosecond timing precision measurement jlarkin att highlandtechnology dott com http://www.highlandtechnology.com
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