How does jk flip flop work

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When the Set or Reset input changes their state while the enable input is 1, the incorrect latching action occurs. Due to its versatility they are available as IC packages. The major applications of JK flip-flop are Shift registers, storage registers, counters and control circuits.

Inspite of the simple wiring of D type flip-flop, JK flip-flop has a toggling nature. This has been an added advantage. Hence they are mostly used in counters and PWM generation, etc. Whenever the clock signal is LOW, the input is never going to affect the output state. The clock has to be high for the inputs to get active. Thus, JK flip-flop is a controlled Bi-stable latch where the clock signal is the control signal.

Thus, the output has two stable states based on the inputs which have been discussed below. According to the table, based on the inputs, the output changes its state.

But, the important thing to consider is all these can occur only in the presence of the clock signal. This, works like SR flip-flop for the complimentary inputs and the advantage is that this has toggling function. Instead of the transfer gates G5 and G6 used in Fig. Any further changes in data at J or K do not now affect the state of the master flip-flop whilst CK is high, because the feedback from Q and Q will always disable which ever of the two input gates could make a change to the master flip flop.

Due to the CK inverter, at the falling edge of the CK pulse, the slave flip-flop now sees a rising edge, and the slave flip-flop accepts the data from q1 and q1 toggling the states of Q and Q. However, in both Figs. Both designs work as predicted for a JK flip-flop, in toggle mode.

However, in modes where J and K can change, the master flip-flop in Fig 5. Therefore it is the data that is present at the instant before the CK falling edge, which is passed to the slave flip-flop. In Fig 5. Although the slave flip-flop is also level triggered, it will not change after the clock input has gone low, because its input is taken from the output of the master flip-flop, which will not be accepting changes due to the clock input being low.

It is also possible to use a negative edge triggered D Type flip-flop to make a negative edge triggered JK flip-flop by this method.

This design therefore, has true edge triggering on both rising and falling edges of the clock pulse, and is immune from any changes in data happening during the high or low level periods of the clock signal except for any changes or disturbances that may occur during the T setup or t hold periods close to the clock pulse edges, as described in Sequential Logic Module 5.

Hons All rights reserved. Revision Learn about electronics Digital Electronics. Number Systems 2. Updated on August 31, By Farhan Sheikh. Farhan Sheikh. I'm an Electrical and Electronics Engineer. On this site, I guide you with different electronic circuits, theories, and how to buy generators for yourself. And yeah, I manage the content planning and editorial of this website. Jack Kilby Reply. What is the function of clock in a flip flop? Is the flip flop available in IC package?

Is jk flip flop excitation table correct?