Introduction to digital logic gates
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- The document discusses different logic gates - AND, OR, NOT, NAND, NOR, XOR, and XNOR - and provides their symbols, truth tables, and example integrated circuit (IC) numbers. - Logic gates take one or more binary inputs and produce a single binary output according to their truth tables. For example, the AND gate outputs 1 only if all inputs are 1, while the OR gate outputs 1 if any input is 1. - Common ICs for different logic gates are also provided, such as the 7400 quad NAND gate and 7486 quad XOR gate. - The document concludes by assigning students to state IC numbers, draw symbols, pin diagrams, and truth tables for the different logic
Introduction to digital logic gates
- 1. DIGITAL TECHNIQUES DR. VIKAS DONGRE HOD ELECTRONICS &TELECOMMUNICATION GOVERNMENT POLYTECHNIC WASHIM (MS) EMAIL: DONGREVJ1@GMAIL.COM M: 9370668979 UNIT2: Logic Gates and Boolean algebra Subtopic: Logic Gates
- 2. AND gate • The AND gate has the above symbol and truth table. • Two or more input bits produce one output bit. • All inputs must be true (1) for the output to be true. • Otherwise the output is false (0). A B Input 0 / 1 0 1 OUTPUT
- 3. 7408- Quad 2 input AND Gate A B Y 0 0 0 0 1 0 1 0 0 1 1 1 Y=A.B
- 4. • The OR gate has the following symbol and truth table. • Two or more input bits produce one output bit. • Either inputs must be true (1) for the output to be true. OR gate
- 5. A B Y 0 0 0 0 1 1 1 0 1 1 1 1 7432- Quad 2 input OR Gate
- 6. • The NOT gate (or inverter) • The simplest possible gate is called an "inverter" or a NOT gate. • One bit as input produces its opposite as output. • The symbol for a NOT gate is shown below. • The truth table for the NOT gate shows input and output.
- 7. 7404- HEX Inverter A Y 0 1 1 0
- 8. What happens when you add a NOT to an AND gate? A B Y X 0 0 0 1 0 1 0 1 1 0 0 1 1 1 1 0 Y
- 9. NAND gate
- 10. A B Y 0 0 1 0 1 1 1 0 1 1 1 0 7400- Quad 2 input NAND Gate
- 11. What happens when you add a NOT to an OR gate? A B X 0 0 1 0 1 0 1 0 0 1 1 0
- 12. • The NOR gate
- 13. A B Y 0 0 1 0 1 0 1 0 0 1 1 0 7402- Quad 2 input NOR Gate
- 14. Exclusive OR gate • Exclusive OR gate are true if either input is true but not both. • The Symbol and Truth Table is shown below. • Output will be high for different inputs • In general output is high when ODD number of inputs are high
- 15. 3 Input X-OR Gate A B C Y 0 0 0 0 0 0 1 1 0 1 0 1 0 1 1 0 1 0 0 1 1 0 1 0 1 1 0 0 1 1 1 1 Y=AΘBΘC
- 17. A B Y 0 0 0 0 1 1 1 0 1 1 1 0 7486- Quad 2 input XOR Gate
- 18. Exclusive NOR gate • The Symbol and Truth Table is shown below. • Output will be high for same inputs • In general output is high when EVEN number of inputs are high
- 20. A B Y 0 0 1 0 1 0 1 0 0 1 1 1 74266- Quad 2 input X-NOR Gate
- 21. A B C Y 0 0 0 1 0 0 1 0 0 1 0 0 0 1 1 1 1 0 0 0 1 0 1 1 1 1 0 1 1 1 1 0 3 Input X-NOR Gate
- 22. Assignment: State IC Number, draw symbol, pin diagram and truth table of AND, OR, NOT, NAND, NOR,XOR, XNOR GATES
- 23. Thank you DR. VIKAS DONGRE HOD ELECTRONICS &TELECOMMUNICATION GOVERNMENT POLYTECHNIC WASHIM (MS) EMAIL: DONGREVJ1@GMAIL.COM M: 9370668979