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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Inspite of the simple wiring of D type flip-flop, JK flip-flop has a toggling nature. The State 4 output shows that the input changes does not affect under this state. This, works like SR flip-flop for the complimentary inputs and the advantage is that this has toggling function.

The same can be verified with the truth table. The truth tables are correct from practical point of view. The “enable” condition does not persist through the entire positive phase of the clock.

It has the input- following character of the clocked D flip-flop but has two inputs,traditionally labeled J and K. Thus, the output has two stable states based on the inputs which have been discussed below.

A simplified version of the versatile J-K flip-flop. The LEDs used are current limited using Ohm resistor. While this implementation of the J-K flip-flop with four NAND gates works in principle, there are problems that arise with the timing.

7476 – 7476 Dual J-K Flip-Flop Datasheet

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.


Hence, this pin always pulled up and can be pulled down only when needed. The below circuit shows a typical sample connection for the JK flip-flop. The changes do not affect the output states, you can verify with the Truth Table above. It is a 14 pin package which contains 2 individual JK flip-flop inside. It can also act as a T flip-flop to accomplish toggling action if J and K are tied together.

The output toggle from the previous state to another state and this process continues for each clock pulse.

Note that the input pins are pulled down to ground through a 1k resistor, this way we can avoid the pin in floating condition. Also we have used LED at output, the source has been limited to 5V to control the supply voltage and DC output voltage.

The clock has to be high for the inputs to get active. The working can be verified with the truth table. 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. The positive going transition PGT of the clock enables the switching of the output Q. 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.

Submitted by admin on 17 July The JK flip flop is considered to be more suitable for practical application because of its truth table that is the output of the flip flop will be stable for all types of inputs. An example is in which each term represents an individual state. The flip-flop will change its output only during the rising edge of the clock signal.

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

Log in or register to post Comment. In asynchronous data transfer, a transfer pulse may be applied at any time to force the data onto the asychronous set and clear inputs, storing the data regardless of what is happening on the other inputs. The term digital in electronics represents the data generation, processing or storing in the form of two states.


Thus, the initial state according to the truth table is as shown above. Tactile Switch — 4No. 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 “. Thus, JK flip-flop is a controlled Bi-stable latch where the clock signal is the control signal.

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.

If J and K are both high at the clock edge then the output will toggle from one state to the other. The term JK flip flop comes after its inventor Jack Kilby.

That is the pin will held to ground when the button is not pressed and when the button is pressed the pin will be held to supply voltage. TL — Programmable Reference Voltage.

SN JK Flip Flop Pinout, Features, Equivalent & Datasheet

Hello clock must be edge trigger. The 9V battery acts as the input to the voltage regulator LM Hence they are mostly used in counters and PWM generation, etc. R is already Pulled up so no need to press the button to make it 1.