Question

1-bit full-adder takes 20 ns to generate carry-out bit and 40 ns for the sum bit. The maximum rate of addition per second, when four 1-bit full adders are cascaded is _______ $\times {10}^6/sec$

• A. 10

Answer 1

The correct option is A 10

Maximum rate of addition = $\frac{1}{100ns}={10}^7/sec=10\times {10}^6/sec$