Question

ECL’s major disadvantage is that __________

(a) It requires more power

(b) It’s fanout capability is high

(c) It creates more noise

(d) It is slow

This question was posed to me in semester exam.

Asked question is from Emitter-Coupled Logic(ECL) in portion Logic Families of Digital Circuits

Answer 1

The correct option is (a) It requires more power

For explanation: ECL’s major disadvantage is that each gate continuously draws current, which means it requires (and dissipates) significantly more power than those of other logic families. But ECL logic gates have clock frequency. Thus, they have a fast operation.