Q. Fastest of all logic families is

A
Emitter coupled logic
B
Resistor Transistor logic
C
CMOS logic
D
Transistor ? Transistor logic
Solution:

The ECL (Emitter Coupled Logic) families, originated in the late 1950s and remain the fastest chips available, but consume more power, and because they use a negative power supply (of -5.2V) have been difficult to interface with other families.

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