GATE | GATE CS 1997 | Question 15

An N-bit carry look ahead adder, where N is a multiple of 4, employs ICs 74181 (4 bit ALU) and 74182 (4 bit carry look ahead generator).
The minimum addition time using the best architecture for this adder is
(A) proportional to N
(B) proportional to logN
(C) a constant
(D) none of the above

Answer: (B)


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