Group 7 combinational logic
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Combinational logic circuits have outputs that are dependent on current input combinations, without memory, timing, or feedback. They are built from basic logic gates like NAND, NOR, and NOT connected together. An example is a decoder that converts a binary input into a decimal output. Unlike sequential logic with memory, combinational logic outputs are determined solely by current input logic states. Adder and subtractor circuits are also discussed, including half and full adders/subtractors, with truth tables and logic diagrams.
Group 7 combinational logic
- 1. Combinational Logic Circuits Submitted To: Inam ul Haq Submitted By: Group 7 Nazia Ali 1043 Nomara Naseer 1030 Mehwish Akhter 1034 Nitasha Masood 1036 University of Education, Okara Campus Next
- 2. Table of Contents Site Map UniversityofEducation,Okara Campus 2 • Combinational logic • Combinational logic diagram • Difference bw combinational and sequential logic • Adder • Half Adder • Full Adder • Subtractor • Half Subtractor • Full Subtractor
- 3. Combinational Logic: Site MapMain Menu UniversityofEducation,Okara Campus 3 In a Combinational Logic Circuit, the output is dependant at all times on the combination of its inputs. So if one of its inputs condition changes state, from 0-1 or 1-0, so too will the resulting output as by default combinational logic circuits have “no memory”, “timing” or “feedback loops” within their design.
- 4. Combinational logic Diagram: Main Menu Site Map UniversityofEducation,OkaraCampus 4
- 5. Continue: Main Menu Site Map UniversityofEducation,OkaraCampus 5 Combinational Logic Circuits are made up from basic logic NAND, NOR or NOT gates that are “combined” or connected together to produce more complicated switching circuits. These logic gates are the building blocks of Combinational Logic Circuits. An example of a combinational circuit is a decoder, which converts the binary code data present at its input into a number of different output lines, one at a time producing an equivalent decimal code at its output.
- 6. Difference bw SequentialAnd Combinational Logic: Main Menu Site Map UniversityofEducation,OkaraCampus 6 Unlike Sequential Logic Circuits whose outputs are dependant on both their present inputs and their previous output state giving them some form of Memory, the outputs of Combinational Logic Circuits are only determined by the logical function of their current input state, logic “0” or logic “1”, at any given instant in time.
- 7. Adder: Main Menu Site Map UniversityofEducation,OkaraCampus 7 Adder is logic circuit which is used to add binary numbers. Types Of Adder: We divide adder into two types on the basis of their functions. Half Adder: Such a logic circuit which is used to add two binary numbers at the same time. It consist of two inputs and two outputs. Full Adder: Such a logic circuit which is used to add more then two binary numbers at the same time. It consist of more then two inputs and two outputs.
- 8. Truth Table of HalfAdderAnd Logic Diagram: Main Menu Site Map UniversityofEducation,OkaraCampus 8
- 9. Truth Table of FullAdderAnd Logic Diagram: Main Menu Site Map UniversityofEducation,OkaraCampus 9
- 10. Half Subtractor: Such a logic circuit which is used to subtract two binary numbers is know as half subtractor. It consist of two inputs and two outputs. 10 UniversityofEducation,Okara Campus
- 11. Full Subtractor: Such a logic circuit which is used to subtract three binary numbers is know as full subtractor. It consist of three inputs and two outputs. 11 UniversityofEducation,Okara Campus