1. WELCOME

2. LOGIC GATE

3. WHAT WE ARE GOING TO LEARN? The Logic Gate. Analogue and Digital signal. Bit and Byte. Boolean Theorem. Description and Circuit analyses of different types of logic Gate.

4. ANALOGUE SIGNAL

5. DIGITAL SIGNAL

6. BITS AND BYTES Bits, Bytes, Mega, Giga, Tera (explained) 1 bit = a 1 or 0 (b) 4 bits = 1 nybble (?) 8 bits = 1 byte (B) 1024 bytes = 1 Kilobyte (KB) 1024 Kilobytes = 1 Megabyte (MB) 1024 Megabytes = 1 Gigabyte (GB) 1024 Gigabytes = 1 Terabyte (TB)

7. BOOLEAN EXPRESSION

8. THE LOGIC GATE A logic gate is an elementary building block of a digital circuit. Most logic gates have two inputs and one output. At any given moment, every terminal is in one of the two binary conditions low (0) or high (1), represented by different voltage levels. digitalcircuitbinaryvoltage

9. KINDS OF LOGIC GATE There are seven kinds logic gates: 1.The AND gate. 2.The OR gate. 3.The NAND gate. 4.The NOR gate. 5.The exclusive OR gate. 6.The exclusive NOR. 7.The NOT gate and the Buffer.

10. BASIC LOGIC GATE

11. KINDS OF LOGIC GATE

12. AND GATE The “AND” element has been compared to a number of switches in series

13. AND GATE

14. TRUTH TABLE OF AND GATE

15. ANALOGE CIRCUIT OF AND GATE

16. OR GATE It is an element, which allows signals to pass from one of a number of inputs to a common output, without allowing any interaction among the inputs.

17. ANALOGUE CIRCUIT OF OR GATE

20. TRUTH TABLE OR GATE ABC 000 011 101 111

21. NOT GATE

22. NAND GATE AND NOR GATE The NAND gate can be constructed by using an AND gate, and directly connecting its output to a NOT gate. The NOT gate inverts the output from the AND gate and, therefore, changes all output logic 1’s to logic 0’s and vice versa.

23. NAND GATE AND NOR The NOR gate. As the NOR gate can be constructed by using an OR gate whose output is directly connected to a NOT element. The NOT element negates (inverts) the output from the OR gate, changing all logic 1’s to logic 0’s and vice versa.

24. NAND GATE AND NOR

25. ABCE 0001 1001 0101 1110 ABCE 0001 0110 1010 1110 NAND GATENOR GATE

26. THREE INPUT NAND GATE Input Output ABCYF 00001 00101 01001 01101 10001 11001 10101 11110

27. THREE INPUT NOR GATE INPUTOUTPUT ABCYF 00001 01010 00110 01110 10010 11010 10110 11110

28. USES OF LOGIC GATE Pin out diagram of a 74266 Quad XNOR DIP- format ICDIP

29. RECAPITULATION The Logic Gate. Analogue and Digital signal. Bit and Byte. Boolean Theorem. Description and Circuit analyses of different types of logic Gate.

30. QUESTION AND ANSWER

31. THANK YOU