![]() But, the important thing to consider is all these can occur only in the presence of the clock signal. According to the table, based on the inputs, the output changes its state. The Q and Q’ represents the output states of the flip-flop. The S (Set) and R (Reset) are the input states for the SR flip-flop. The memory size of SR flip flop is one bit. Thus, the output has two stable states based on the inputs which have been discussed below. Again, this gets divided into positive edge triggered SR flip flop and negative edge triggered SR flip-flop. Thus, SR flip-flop is a controlled Bi-stable latch where the clock signal is the control signal. The clock has to be high for the inputs to get active. Whenever the clock signal is LOW, the inputs S and R are never going to affect the output. Here we are using NAND gates for demonstrating the SR flip flop. Either of them will have the input and output complemented to each other. SR latch can be built with NAND gate or with NOR gate. But now-a-days JK and D flip-flops are used instead, due to versatility. SR Flip-flops were used in common applications like MP3 players, Home theatres, Portable audio docks, and etc. Here in this article we will discuss about SR Flip Flop and will explore the other Flip Flop in later articles. 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. Generally, these latch circuits can be either active-high or active-low and they can be triggered by HIGH or LOW signals respectively. The latches can also be understood as Bistable Multivibrator as two stable states. So, we are going to discuss about the Flip-flops also called as latches. Thus, this latching process in hardware is done using certain components like latch or Flip-flop, Multiplexer, Demultiplexer, Encoders, Decoders and etc collectively called as Sequential logic circuits. An example is 011010 in which each term represents an individual state. The high is 1 and low is 0 and hence the digital technology is expressed as series of 0’s and 1’s. The two states can be represented as HIGH or LOW, positive or non-positive, set or reset which is ultimately binary. The term digital in electronics represents the data generation, processing or storing in the form of two states. ![]()
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