Discussion
Propagation delay of logic families in descending order can be listed as :
Answer: C
In descending order of propagation delay the families are CMOS, TTL, ECL.
Standard CMOS (the 4000 series) is the slowest of the three, with delays of tens of nanoseconds, because its high-impedance transistors charge load capacitance slowly. Standard TTL is faster, about 10 ns per gate. ECL is the fastest, around 1 ns or less, because its transistors never saturate and so do not have to clear stored charge before switching.
The options beginning with ECL list the fastest family first, which is ascending order, and the option starting with TTL puts ECL in the middle.
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