Emitter-Coupled Logic:
ECL Circuit:
It consist of two transistor connected in different single ended input mode with a common emitter resistence.
The circuit has two outputs inverting and non inverting output.
Input LOW and HIGH voltage are defined as 3.6 v and 4.4 v and it produce output LOW and HIGH levels as 4.2v and 5.0v.
Advantages;
It is fastest logic family.
Large fan-out.
Less switching transient (Power supply is more stable)
Transistor are not allowed to go into complete saturation and eliminating storage delays.
Disadvantage:
Low nise immunity
High power dissipation.
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