Question

The propagation delay for ECL IC family is approximately ?

• A. 2 ns
• B. 10 ns
• C. 25 ns
• D. 50 ns

Answer 1

Answer: (A)

2 ns

The propagation delay for ECL IC family is approximately 2 ns.

It is an old technology and the speed is due to the fact that the transistors never enter saturation. So there is no time to wait for the transistor to come out of saturation. However, this logic works with negative power supplies and does dissipate more power than other logic families.

Emitter-coupled logic(ECL) is a high-speed integrated circuit bipolar transistor logic family.

A logic family of monolithic digital integrated circuit devices is a group of electronic logic gates constructed using one of several different designs, usually with compatible logic levels and power supply characteristics within a family.