The term flip-flop has historically referred generically to both level-triggered and edge-triggered circuits that store a single bit of data using gates. It can also be used for counting of pulses, and for synchronizing variably-timed input signals to some reference timing signal.įlip-flops can be either level-triggered (asynchronous, transparent or opaque) or edge-triggered ( synchronous, or clocked). When used in a finite-state machine, the output and next state depend not only on its current input, but also on its current state (and hence, previous inputs). Such data storage can be used for storage of state, and such a circuit is described as sequential logic in electronics. A flip-flop is a device which stores a single bit (binary digit) of data one of its two states represents a "one" and the other represents a "zero". Flip-flops and latches are fundamental building blocks of digital electronics systems used in computers, communications, and many other types of systems.įlip-flops and latches are used as data storage elements. It is the basic storage element in sequential logic. The circuit can be made to change state by signals applied to one or more control inputs and will have one or two outputs. 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. Toggling occurs during the entire process because the output changes once in the cycle.An animated interactive SR latch ( R1, R2 = 1 kΩ R3, R4 = 10 kΩ).The output of the master remains one until the clock is not set to 0 again. The slave flip flop is operational when the clock pulse is 0.The slave's output remains 0 until the clock is not set to 0 because the slave flip flop is not operational. The master flip flop is operational when the clock pulse is 1.When the clock pulse becomes high again, then the master's output is 0, which will be set to 1 when the clock becomes one again.When the clock pulse set to 1, the output of the master flip flop will be one until the clock input remains 0.The flip flop will be disabled, and Q remains unchanged when both the inputs of the JK flip flop set to 0.At that time, the slave flip flop toggles on the clock's negative transition. The master flip flop toggles on the clock's positive transition when the inputs J and K set to 1.The clock's negative transition sets the slave and copies the master. When J=1, and K=0, the output Q=1 is passed to the J input of the slave.The clock forces the slave flip flop to work as reset, and then the slave copies the master flip flop. The output Q'=1 of the master flip flop is passed to the slave flip flop as an input K when the input J set to 0 and K set to 1.The master flip flop responds first from the slave because the master flip flop is the positive level trigger, and the slave flip flop is the negative level trigger.When the CP set to 0, the master flip-flop passes the information to the slave flip flop to obtain the output. The "slave" remains isolated until the CP is 1. When the clock pulse is true, the slave flip flop will be in the isolated state, and the system's state may be affected by the J and K inputs.In simple words, when CP set to false for "master", then CP is set to true for "slave", and when CP set to true for "master", then CP is set to false for "slave". For passing the inverted clock pulse to the "slave" flip flop, the inverter is connected to the clock's pulse. In "master-slave flip flop", apart from these two flip flops, an inverter or NOT gate is also used. The output of the "slave" flip flop is passed to inputs of the master flip flop. The master-slave flip flop is designed in such a way that the output of the "master" flip flop is passed to both the inputs of the "slave" flip flop. In these two flip flops, the 1st flip flop work as "master", called the master flip flop, and the 2nd work as a "slave", called slave flip flop.
Master slave flip flop vs edge triggered flip flop series#
These flip flops are connected in a series configuration. The master-slave flip flop is constructed by combining two JK flip flops. This problem is referred to as a race-round condition in JK flip-flop and avoided by ensuring that the CLK set to 1 only for a very short time. Thus, the uncertain or unreliable output produces. In "JK Flip Flop", when both the inputs and CLK set to 1 for a long time, then Q output toggle until the CLK is 1.