Understanding JK Flip Flop Circuits

In summary, the conversation discussed the concept of JK flip-flops and provided recommendations for understanding and reading the table. A link to the Texas Instruments 74HC112 datasheet and a simpler version of the JK flip-flop on Wikipedia were shared. The function of the flip-flop, which includes inputs J and K and the clock, was explained as well as how the output Q is affected by these inputs. It was also mentioned that understanding the basic idea of flip-flops and the difference between S-R and JK flip-flops can be helpful in understanding the concept.
  • #1
teng125
416
0
does anybody knows how to read the table or has any explanation for jk flip flop??any website recommended pls...
 
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  • #2
Just check out the datasheet for a typical JK FF. It should have what you need. Here's a link to the Texas Instruments 74HC112 datasheet on Jameco's website:

http://rocky.digikey.com/scripts/ProductInfo.dll?Site=US&V=296&M=SN74HC112N [Broken]
 
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  • #3
That flip flop is probably a little more complicated than what he needs since it includes "pre" and "clr" inputs. The wikipedia article has a slightly simpler one:

http://en.wikipedia.org/wiki/Flip-flop_(electronics)
(the J-K flip flop truth table halfway down the page)

The flip flop has 2 inputs, J and K (and also the clock). It remembers what the output Q was previously. On a clock edge, if J and K are 0, then the output Q remains unchanged. If J and K are 1, then the output Q flips from a 0 to a 1 or from a 1 to a 0. If K is 1 and J is 0, Q is set to 0, and if K is 0 and J is 1, Q is set to 1.
 
  • #4
What helped me was understanding fully basic idea of flip-flop and what S-R ff does, then J-K is just S-R with only difference in 11 input, where S-R goes unstable while J-K toggles (complements current state).

EDIT:
But basically, as was said above: Q' is what you are "concerned" about, i.e. next state. Q' is a ff-particular function that depends on inputs J and K and present state Q. In other words, D and JK ff react (or have Q' function) differently to the same inputs and current state Q.
 
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1. What is a JK flip flop circuit?

A JK flip flop circuit is a sequential logic circuit that has two inputs, J (set) and K (reset), and two outputs, Q (output) and Q' (complementary output). It can store one bit of data, either 0 or 1, and can change its state based on the inputs and the clock signal.

2. How does a JK flip flop work?

A JK flip flop works by using the J and K inputs to determine its next state. When both inputs are 0, the current state is maintained. When both inputs are 1, the output is toggled, meaning the current state is changed to the opposite value. When J is 1 and K is 0, the output is set to 1 and when J is 0 and K is 1, the output is reset to 0. The clock signal is used to synchronize the state changes.

3. What are the applications of JK flip flop circuits?

JK flip flop circuits are commonly used in digital systems for storing data, counting, and frequency division. They are also used in control circuits for sequential logic and in memory circuits for storing multiple bits of data.

4. What is the difference between a JK flip flop and other types of flip flops?

The main difference between a JK flip flop and other types of flip flops, such as D, T, and SR flip flops, is that it has two inputs instead of one. This allows for more flexibility in controlling the state changes and makes it more suitable for certain applications, such as frequency division.

5. How can I design a JK flip flop circuit?

The design of a JK flip flop circuit involves selecting the appropriate logic gates and connecting them in a specific way to achieve the desired functionality. The inputs and outputs must be properly connected to the gates and a clock signal must be used to synchronize the state changes. It is important to understand the truth table and timing diagram of a JK flip flop in order to design an effective circuit.

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