The SN54/74LS76A offers individual J, K, Clock Pulse, Direct Set and Di- rect Clear inputs. These dual flip-flops are designed so that when the clock goes HIGH. The SN74LS76A offers individual J, K, Clock Pulse, Direct Set and. Direct Clear inputs. These dual flip-flops are designed so that when the clock goes HIGH, the . SN is a dual in-line JK flip flop IC, i.e. it has two JK flip flops inside it and each can be used individually based on our application.

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The J-K flip-flop is the most versatile of the basic flip-flops.

Tactile Switch — 4No. The output state of the flip flops can be determined from the truth table below. Note that the outputs feed back to the enabling NAND gates. Below snapshot shows it.

This is an application of the versatile J-K flip-flop. The term digital in electronics represents the data generation, processing or storing catasheet the form of two states. In synchronous data transfer between two J-K flip-flopsa transfer signal on the clock input causes transfer from cell A to cell B.

JK Flip-Flop Circuit Diagram, Truth Table and Working Explained

An example is in which each term represents an individual state. While this implementation of the J-K flip-flop with four NAND gates works in principle, there are problems that arise with the timing.

When the clock makes a positive transition the master section is triggered but the slave section is not because its clock is inverted. The flip-flops are also called as latching devices meaning it can remember one single bit of data and latch the output based on it, due to this property they are commonly used as shift registers, control registers, storage registers or where ever a small memory is required.


Log in or register to post Comment. If J and K are both high at the clock edge then the output will toggle from one state to the other. Hence they are mostly used in counters and PWM generation, etc.

The below circuit shows a typical sample connection for the JK flip-flop. Quote and Order boards in minutes on https: The latches can also be understood as Bistable Multivibrator as two stable states.

Hello clock must be edge trigger. Hence, default input state will be LOW across all the pins except R which is state of normal operation. The truth tables are correct from practical point of view. The changes do not affect the output states, you can verify with the Truth Table above. R is already Pulled up so no need to press the button to make it 1.

J-K Flip-Flop

This, works like SR flip-flop for the complimentary inputs and the advantage is that this has toggling function. Normally during regular operation fflop the IC the reset pin will be set high and the clock pulse of known frequency will be supplied to the clock pin, then the value o J and K will be varied based on the input signals and the respective output will be obtained on the Q and Q bar pins.

The clock signal here is just a push button but can be type of pulse like a PWM signal. The working can be verified with the truth table. Hence, the regulated 5V output is used as the Vcc and pin supply to the IC.

The flip-flop will change its output only during the rising edge of the clock signal. So if you are looking for a IC for latching purpose or to act as a small programmable memory for you project then this IC might be the right choice for you. It can also act as a T flip-flop to accomplish toggling action if J and K are tied together.

This has been an added advantage. The complete working and all the states are also demonstrated in the Video below. Hence, this pin always pulled up and can be pulled down only when needed.


The positive going transition PGT of the clock enables the switching of the output Q. Thus, comparing the three input and two input NAND gate truth table and applying the inputs as given in JK flip-flop truth table the output can be analysed. R is already Pulled up so we need to press the button to make it 0. Out of the above types only JK and D flip-flops are available in the integrated IC form and also used widely in most of the applications.

Also we have used LED at output, the source has been limited to 5V to control the supply voltage and DC output voltage. The inputs are labeled J and K in honor of the inventor of the device, Jack Kilby.

SN JK Flip Flop Pinout, Features, Equivalent & Datasheet

The timing pulse must be very short because a change in Q before the clock pulse goes off can drive the circuit into an oscillation called ” racing “. The toggling might be a desired behavior, but generally you would like for the times of toggling to be controlled by the clock pulses as enablers so that you could control and predict the output. Whenever the clock signal is LOW, the input is never going to affect the output state.

Thus, the initial state according to the truth table is as shown above.

The 9V battery acts as the input to the voltage regulator LM A simplified version of the versatile J-K flip-flop. Note that the input pins are pulled down to ground through a 1k resistor, foop way we can avoid the pin in floating condition.

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