Negative edge triggered flip flop nor gates
So, for a value of Q = 1, it switches to Q=0 and for a value of Q = 0, it switches to Q=1. When both the inputs J and K have a HIGH state, the flip-flop switch to the complement state. The letter J stands for SET and the letter K stands for CLEAR. The behavior of inputs J and K is same as the S and R inputs of the S-R flip flop. The only difference is that the intermediate state is more refined and precise than that of a S-R flip flop. J-K Flip FlopĪ J-K flip flop can also be defined as a modification of the S-R flip flop. The circuit diagram and truth-table of a J-K flip flop is shown below. TAKE A LOOK : MASTER-SLAVE FLIP FLOP CIRCUIT 3. To know more about the triggering of flip flop click on the link below. If it is ‘0’, the flip flop switches to the CLEAR state. When CP is HIGH, the flip flop moves to the SET state. The D input is passed on to the flip flop when the value of CP is ‘1’. From the figure you can see that the D input is connected to the S input and the complement of the D input is connected to the R input. D Flip Flopĭ flip flop is actually a slight modification of the above explained clocked SR flip-flop. The circuit diagram and truth table is given below. Thus the invalid states can be eliminated. Thus either of the two states may be caused, and it depends on whether the set or reset input of the flip-flop remains a ‘1’ longer than the transition to ‘0’ at the end of the pulse. As soon as the pulse is removed, the flip flop state becomes intermediate. But when the values of both S and R values turn ‘1’, the HIGH value of CP causes both of them to turn to ‘0’ for a short moment.
This makes the values at S and R to pass through the NOR Gate flip flop. As soon as a pulse is given the value of CP turns ‘1’. When the value of the clock pulse is ‘0’, the outputs of both the AND Gates remain ‘0’. Clocked S-R Flip FlopĪ clock pulse is given to the inputs of the AND Gate. The circuit diagram and truth table is shown below. For this, a clocked S-R flip flop is designed by adding two AND gates to a basic NOR Gate flip flop. This problem can be overcome by using a bistable SR flip-flop that can change outputs when certain invalid states are met, regardless of the condition of either the Set or the Reset inputs. The problems with S-R flip flops using NOR and NAND gate is the invalid state. If both the values of S and R are switched to 1, then the circuit remembers the value of S and R in their previous state.
They are supposed to be compliments of each other. If both the values of S and R are switched to 0 it is an invalid state because the values of both Q and Q’ are 1. In both the states you can see that the outputs are just compliments of each other and that the value of Q follows the compliment value of S. Like the NOR Gate S-R flip flop, this one also has four states. The circuit of the S-R flip flop using NAND Gate and its truth table is shown below. This is an invalid state because the values of both Q and Q’ are 0. If both the values of S and R are switched to 0, then the circuit remembers the value of S and R in their previous state. In both the states you can see that the outputs are just compliments of each other and that the value of Q follows the value of S. S-R Flip Flop using NOR Gateįrom the diagram it is evident that the flip flop has mainly four states. The diagram and truth table is shown below. The design of such a flip flop includes two inputs, called the SET and RESET. These flip flops are also called S-R Latch. The SET-RESET flip flop is designed with the help of two NOR gates and also two NAND gates. There are mainly four types of flip flops that are used in electronic circuits. As a memory relies on the feedback concept, flip flops can be used to design it. The most commonly used application of flip flops is in the implementation of a feedback circuit.
A higher application of flip flops is helpful in designing better electronic circuits. When a certain input value is given to them, they will be remembered and executed, if the logic gates are designed correctly. Flip flops can also be considered as the most basic idea of a Random Access Memory. With the help of Boolean logic you can create memory with them. Click on the links below for more information.įlip flops are actually an application of logic gates. This article deals with the basic flip flop circuits like S-R Flip Flop, J-K Flip Flop, D Flip Flop, and T Flip Flop along with truth tables and their corresponding circuit symbols.īefore going to the topic it is important that you get knowledge of its basics. In this article, let’s learn about different types of flip flops used in digital electronics.