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Commercial ECL families are not nearly as popular as TTL and CMOS mainly because they ___________

(a) Produces too much noise

(b) Consume too much power

(c) Have high fan-in

(d) Have high fan-out

The question was posed to me in an international level competition.

My question is from Compatibility or Interfacing topic in chapter Logic Families of Digital Circuits

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The correct option is (b) Consume too much power

For explanation I would say: Commercial ECL families are not nearly as popular as TTL and CMOS mainly because they consume too much power. CMOS consumes the least power while TTL provides high speed.

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