In these circuits, latches are considered to be the simplest elements used for retaining the earlier state. Sequential circuits are used in the case of flip-flops and latches. These circuits are used in association with encoders, adders, decoders, subtractors, multiplexers, etc. The circuits that are not triggered are termed as asynchronous sequential circuits.Īdder. The flip-flops, if triggered, are termed as synchronous sequential circuits. Sequential logic circuits are clocked, and so they are triggered for operations with the help of electronic pulses. The elementary building units of sequential logic circuits are Flip flops (binary storage devices).Ĭombinational circuits are independent of a clock therefore, triggering is not essential for their operations. The primary building blocks of combinational circuits are logic gates. Useful for data storage and therefore used in RAM. The circuits are represented with the help of Boolean algebra they are further simplified with the usage of fundamental and universal logic gates. Mainly used or the purpose of Boolean and Arithmetic operations. These circuits need feedback from the output to save inputs in the memory space for the next set of operations. Combinational circuits generally output the input as per the logic designed. They contain memory elements that store data in digital circuits. Sequential circuits have the memory space needed for storing the current states sent as control inputs (enable) for the next set of operations. Storage of data and memory space allocationĬombinational circuits are not capable of storing data (state). The output is in the form of functions related to clock, current inputs as well as the previous states of a given system. The output is in the form of functions of the current inputs or time-independent logic. Combinational and Sequential Circuits Comparison Chart Basis of difference When it comes to an understanding of the essential concepts of digital electronics, then combinational and Sequential circuits are the two concepts that have to be understood in entirety.
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