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In electronics , a flip-flop or latch is a circuit that has two stable states and can be used to store state information — a bistable multivibrator. The circuit can be made to change state by signals applied to one or more control inputs and will have one or two outputs. It is the basic storage element in sequential logic. Flip-flops and latches are fundamental building blocks of digital electronics systems used in computers, communications, and many other types of systems.
Difference between SR Flipflop and RS Flipflop ?
In previous chapter, we discussed about Latches. Those are the basic building blocks of flip-flops. We can implement flip-flops in two methods. In first method, cascade two latches in such a way that the first latch is enabled for every positive clock pulse and second latch is enabled for every negative clock pulse. So that the combination of these two latches become a flip-flop. In second method, we can directly implement the flip-flop, which is edge sensitive.
Another variation on a theme of bistable multivibrators is the J-K flip-flop. Look closely at the following diagram to see how this is accomplished:. What used to be the S and R inputs are now called the J and K inputs, respectively. The old two-input AND gates have been replaced with 3-input AND gates, and the third input of each gate receives feedback from the Q and not-Q outputs. What this does for us is permit the J input to have effect only when the circuit is reset, and permit the K input to have effect only when the circuit is set. In other words, the two inputs are interlocked , to use a relay logic term, so that they cannot both be activated simultaneously. When both J and K inputs are 1, however, something unique happens.
The J-K Flip-Flop
A SR flip-flop is used in clocked sequential logic circuits to store one bit of data. It is similar in function to a gated SR latch but with one major difference: where the gated latch can have its data set and reset many times whilst the gate input is 1 , the flip-flop can only have the data set or reset once during a clock cycle. The latch is said to be transparent as the outputs see the inputs when the gate input is 1.
A Flip Flop is a bi-stable device. There are three classes of flip flops they are known as Latches , pulse-triggered flip-flop, Edge- triggered flip flop. In this set word means that the output of the circuit is equal to 1 and the word reset means that the output is 0. In this article, RS Flip Flop is explained in detail. The RS Flip Flop is considered as one of the most basic sequential logic circuits.
Library: Memory Introduced: 2. Each flip-flop stores a single bit of data, which is emitted through the Q output on the east side. Normally, the value can be controlled via the inputs to the west side.
The J-K flip-flop is the most versatile of the basic flip-flops. It has the input- following character of the clocked D flip-flop but has two inputs,traditionally labeled J and K. If J and K are different then the output Q takes the value of J at the next clock edge.