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In digital circuits, a flip-flop is a term referring to an electronic circuit (a bistable multivibrator) that has two stable states and thereby is capable of serving as one bit of memory. Today, the term flip-flop has come to mostly denote non-transparent (clocked or edge-triggered) devices, while the simpler transparent ones are often referred to as latches; however, as this distinction is quite new, the two words are sometimes used interchangeably.

A flip-flop is usually controlled by one or two control signals and/or a gate or clock signal. The output often includes the complement as well as the normal output. As flip-flops are implemented electronically, they require power and ground connections.

NOR SR (Set Reset) Flip Flop Logic Diagram
S R Q Q'  
1 0 1 0  
0 0 1 0 ( After S=1 R=0 )
0 1 0 1  
0 0 0 1 ( After S=0 R=1 )
1 1 0 0  

NAND SR (Set Reset) Flip Flop Logic Diagram
S R Q Q'  
1 0 0 1  
1 1 0 1 ( After S=1 R=0 )
0 1 1 0  
1 1 1 0 ( After S=0 R=1 )
0 0 1 1  

16 Dec 2012

very helpful,,
thanks a lot

Lovin it
17 Dec 2012

This little program helps so much understand the flip flops!!! m:)

26 Dec 2012

I'd like to thank you sir for these efforts to easy the understanding of this concept !! thanks a lot.

30 Dec 2012

This is great ...Thank you very much for this and youtube video...thanks again

07 Jan 2013

This is very helpful!!!

30 Jan 2013

its very useful

amour lesangwa
01 Feb 2013

goooooooooooooooooooood work

13 Feb 2013

thanks, very very useful.

20 Feb 2013

thank you so much ! :)

06 Mar 2013

Love the simulation! It should be noted however, that this is not a flip flop. Flip flops have a clock signal as to when they are allowed to change. This is a SR latch.

nazri khir
07 Mar 2013

good one's :)

Ariba Niazi
15 Mar 2013

most helpfull topic guys.......

Ariba Niazi
15 Mar 2013

gooooood n hlpfull

vivekanand patel
03 Apr 2013

yhank you so...............much

04 Apr 2013

Thank you very much for this flip flop sr diagram i am understanding very much of this diagram

05 Apr 2013

really usefull thanks alot...........

27 Apr 2013

Thank u so much for rembering logic by this page. Thanks alot.....

Danig Schonweiss
29 Apr 2013

Thank you Mr

This was so much fun. It was difficult and easy. Now I understand, but I am confused.

Help me now?


11 Jul 2013

Great Stuff!

17 Sep 2013

oooooooooohhhhhhhhhhhhhhhhhhh awesoooooooooooooooommmmmmmmmmmmmmmmmmmmmmmeeeeeeeeeeeee work...............

19 Sep 2013


04 Oct 2013


20 Oct 2013

thank you ...
helpful ...

21 Oct 2013

Made Perfect sense.! No bullshit.! To the point, NAILED IT :D

usman ghani
23 Dec 2013

great things thanks u

Tabrez Ahmad
23 Mar 2014


Ranjan Barman
31 Mar 2014

Nice information

Mohammed Sohail
02 May 2014

Hi, its really helpful thankyou and iloveyou

24 Jul 2014

the second figure appears wrong....reset end is complement of Q right

Julio Duran
09 Aug 2014

The video about Francis Turbine is an excellent tool for learning how a Dam generate electricity. Thank you very much. Your channel deserve a lot of attention from the public and the government.

James Franco
04 Nov 2014

Thank you! This was very insightful!

krishnkant tiwary
06 Nov 2014

very very help full

05 Nov 2018

This really helped me out last night and I didnt even have to stay up late for my homework

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