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# Logic gates and logic circuits

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### Logic gates and logic circuits

1. 1. Introduction to Logic Gates AND Gate It is an electronic circuit, which generates an output signal of 1 if and only if all input signals are also 1 An AND gate is the physical realization of the logical multiplication ( AND operation ) Input 1 i 0 0/1 A B Suppose Input is 10 Suppose Input is OUTPUT
2. 2. Block Diagram of AND Gate A Output B 1 . INPUT 1 = OUTPUT 1 1 1 1 0 0 0 1 0 0 0 0 1 d i 0/1 1 A B OUTPUT
3. 3. Block Diagram of AND Gate A Output B 1 . INPUT 0 = OUTPUT 1 1 1 1 0 0 0 1 0 0 0 0 0 i 0/1 0 A B OUTPUT
4. 4. Block Diagram of AND Gate A Output B 0 . INPUT 1 = OUTPUT 1 1 1 1 0 0 0 1 0 0 0 0 0 i 0/1 0 A B OUTPUT
5. 5. Block Diagram of AND Gate A Output B 0 . INPUT 0 = OUTPUT 1 1 1 1 0 0 0 1 0 0 0 0 0 i 0/1 0 A B OUTPUT
6. 6. OR Gate It is an electronic circuit, which generates an output signal of 1, if any of the output signals is 1 It is the physical realization of logical OR i 1 A 0/1 1 B 1 OUTPUT
7. 7. Block Diagram of OR Gate A B 1 + INPUT 1 = OUTPUT 1 B 0 1 1 1 0 0/1 1 0 A 1 1 i 1 0 0 gg 1 OUTPUT
8. 8. Block Diagram of OR Gate A B 1 + INPUT 0 = OUTPUT 1 B 0 1 1 1 0 0/1 1 0 A 1 1 i 1 0 0 gg 1 OUTPUT
9. 9. Block Diagram of OR Gate A B 0 + INPUT 1 = OUTPUT 1 B 0 1 1 1 0 0/1 1 0 A 1 1 i 1 0 0 gg 1 OUTPUT
10. 10. Block Diagram of OR Gate A B 0 + INPUT 0 = OUTPUT 1 B 0 1 1 1 0 0/1 1 0 A 1 1 i 0 0 0 gg 1 OUTPUT
11. 11. NOT Gate It is an electronic circuitthat generates an output signal, which is reverse of input signal It is the physical realization of complementation operation INPUT OUTPUT 0 1 1 0 A 0 1 Output Not Gate is also called inverter because it inverts the input.
12. 12. NOT Gate INPUT 0 1 1 1 A OUTPUT 0 0 Ā
13. 13. Symbol of NAND gate NAND Gate Not AND Gate - NOT + AND gate It is a combination of NOT and AND gates It is Complemented AND Gate A.B A Output B Truth Table Equation of NAND Gate INPUT OUTPUT 1 A↑B = = + 1 0 1 0 1 0 1 1 0 0 1
14. 14. Symbol of NAND gate NAND Gate Not AND Gate - NOT + AND gate It is a combination of NOT and AND gates It is Complemented AND Gate A.B A Output B Truth Table Equation of NAND Gate INPUT OUTPUT 1 A↑B = = + 1 0 1 0 1 0 1 1 0 0 1
15. 15. Symbol of NAND gate NAND Gate Not AND Gate - NOT + AND gate It is a combination of NOT and AND gates It is Complemented AND Gate A.B A Output B Truth Table Equation of NAND Gate INPUT OUTPUT 1 A↑B = = + 1 0 1 0 1 0 1 1 0 0 1
16. 16. Symbol of NAND gate NAND Gate Not AND Gate - NOT + AND gate It is a combination of NOT and AND gates It is Complemented AND Gate A.B A Output B Truth Table Equation of NAND Gate INPUT OUTPUT 1 A↑B = = + 1 0 1 0 1 0 1 1 0 0 1
17. 17. NOR Gate Symbol of NOR Gate NOT – OR Gate NOT Gate + OR Gate A It is complement OR gate B Output A+B A B Output 1+1=0 Truth Table INPUT Equation of NOR Gate OUTPUT 1 A↑B = = . 1 0 1 0 0 0 1 0 0 0 1
18. 18. NOR Gate Symbol of NOR Gate NOT – OR Gate NOT Gate + OR Gate A It is complement OR gate B Output A+B A B Output 1+0=0 Truth Table INPUT Equation of NOR Gate OUTPUT 1 A↑B = = . 1 0 1 0 0 0 1 0 0 0 1
19. 19. NOR Gate Symbol of NOR Gate NOT – OR Gate NOT Gate + OR Gate A It is complement OR gate B Output A+B A B Output 0+1=0 Truth Table INPUT Equation of NOR Gate OUTPUT 1 A↑B = = . 1 0 1 0 0 0 1 0 0 0 1
20. 20. NOR Gate Symbol of NOR Gate NOT – OR Gate NOT Gate + OR Gate A It is complement OR gate B Output A+B A B Output 0+0=1 Truth Table INPUT Equation of NOR Gate OUTPUT 1 A↑B = = . 1 0 1 0 0 0 1 0 0 0 1
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