The CD4013B dual D-type flip-flop is a monolithic complementary
MOS (CMOS) integrated circuit constructed with
N- and P-channel enhancement mode transistors. Each
flip-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. Setting or resetting is independent of the clock and
is accomplished by a high level on the set or reset line
respectively.
Features

Wide supply voltage range: 3.0V to 15V

High noise immunity: 0.45 VDD (typ.)

Low power TTL: fan out of 2 driving 74L
compatibility: or 1 driving 74LS
Applications
? Automotive
? Data terminals
? Instrumentation
? Medical electronics
? Alarm system
? Industrial electronics
? Remote metering
? Computers