Practical Electronics/IC/4013

4013
Logic Type	Sequential
Function Family	Flip-flop
Description	Dual D-type flip-flop with asynchronous set-reset
Pins	14
Pinout
Functional Diagram

The 4013 contains two independent D-type flip-flops with asynchronous set/reset inputs. Whenever the set or reset pins go high, the appropriate output is expressed immediately on the outputs. When set and reset are low, the output shows the data at the input at the time of the last low-to-high clock transition. This is then held until the next transition.

For more information on D-type flip-flops, refer to this module.

Function Tables for a single flip-flop

Inputs					Outputs
S	R	D	C		Q	Q
H	L	X	X		H	L
L	H	X	X		L	H
H	H	X	X		H	H

Inputs					Outputs
S	R	D	C		Qn+1	Qn+1
L	L	L			L	H
L	L	H			H	L

Further Reading

• Digital Circuits' module on Flip-flops