The CD4013B dual D-type flip-flop is a monolithic complementary MOS (CMOS) integrated circuit constructed with N- and P-channel enhancement mode transistors .
Eachflip-flop has independent data, set, reset, and clock inputs and “Q” and “Q” outputs. These devices can be used for shift register applications, and by connecting “Q” output to
the data input, for counter and toggle applications. The logic level present at the “D” input is transferred to the Q output during the positive-going transition of the clock pulse.