DIGITAL DESIGN Lecture Notes - Lecture 4: Binary-Coded Decimal, Logic Gate, Sequential Logic
11 Sep 2021
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Document Summary
A combinational circuit consists of logic gates whose outputs at any time are determined from only the present combination of inputs. A combinational circuit performs an operation that can be specified logically by a set of boolean function. In many applications, the source and destination are storage registers. If the registers are included with the combinational gates, then the total circuit must be considered to be a sequential circuit. There are several combinational circuits that are employed extensively in the design of digital systems. These circuits are available in integrated circuits and are classified as standard components. They perform specific digital functions commonly needed in the design of digital systems. the most important standard combinational circuits, such as adders, subtractors, comparators, decoders, encoders, and multiplexers. These components are available in integrated circuits as medium-scale integration (msi) circuits. They are also used as standard cells in complex very largescale integrated (vlsi) circuits such as application-specific integrated circuits (asics).
