Combinational Circuits | Digital Logic Circuits
Subject and UNIT: Digital Logic Circuits: Unit II: Combinational Circuits
Digital Logic Circuits: Unit II: Combinational Circuits : Two Marks Questions with Answers
K-map simplification design | Combinational Circuits
Subject and UNIT: Digital Logic Circuits: Unit II: Combinational Circuits
• There is a wide variety of binary codes used in digital systems. Some of these codes are Binary-Coded-Decimal (BCD), Excess-3, Gray and so on. Many times it is required to convert one code to another.
Block and Logic diagram, Logic symbol, Function table
Subject and UNIT: Digital Logic Circuits: Unit II: Combinational Circuits
• An encoder is a digital circuit that performs the inverse operation of a decoder. An encoder has 2n (or fewer) input lines and n output lines. In encoder the output lines generate the binary code corresponding to the input value.
Block and Logic diagram, Logic symbol, Function table
Subject and UNIT: Digital Logic Circuits: Unit II: Combinational Circuits
• A decoder is a multiple-input, multiple-output logic circuit which converts coded inputs into coded outputs, where the input and output codes are different.
Types, Block and Logic diagram, Logic symbol, Function table, Equivalent circuit, Working, Applications
Subject and UNIT: Digital Logic Circuits: Unit II: Combinational Circuits
• A demultiplexer is a circuit that receives information on a single line and transmits this information on one of 2n possible output lines. The selection of specific output line is controlled by the values of n selection lines.
Block and Logic diagram, Logic symbol, Function table, Equivalent circuit, Working
Subject and UNIT: Digital Logic Circuits: Unit II: Combinational Circuits
• In digital systems, many times it is necessary to select single data line from several data-input lines, and the data from the selected data line should be available on the output. The digital circuit which does this task is a multiplexer.
Block and Logic diagram, Truth Table, Operation function, Example Problems
Subject and UNIT: Digital Logic Circuits: Unit II: Combinational Circuits
• The digital systems handle the decimal number in the form of binary coded decimal numbers (BCD). A BCD adder is a circuit that adds two BCD digits and produces a sum digit also in BCD. Here, we will see the implementation of addition of BCD numbers.
Combinational Circuits
Subject and UNIT: Digital Logic Circuits: Unit II: Combinational Circuits
• The addition and subtraction operations can be combined into one circuit with one common binary adder. This is done by including an exclusive-OR gate with each full adder.
Block diagram, Working Principle | Combinational Circuits
Subject and UNIT: Digital Logic Circuits: Unit II: Combinational Circuits
• The subtraction of binary numbers can be done most conveniently by means of complements. Remember Cout3’ that the subtraction A-B can be done by taking the 2's complement of B and adding it to A.
Block diagram, Working Principle | Combinational Circuits
Subject and UNIT: Digital Logic Circuits: Unit II: Combinational Circuits
• We have seen, a single full-adder is capable of adding two one-bit numbers and an input carry. In order to add binary numbers with more than one bit, additional full-adders must be employed.
Logic diagram, Truth Table, Operation function, Example Problems | Combinational Circuits
Subject and UNIT: Digital Logic Circuits: Unit II: Combinational Circuits
• The subtraction consists of four possible elementary operations, namely,
Half, Full Adder | Logic diagram, Truth Table, Operation function, Example Problems
Subject and UNIT: Digital Logic Circuits: Unit II: Combinational Circuits
• Digital computers perform various arithmetic operations. The most basic operation, no doubt, is the addition of two binary digits. This simple addition consists of four possible elementary operations, namely,