welcome. logic gate what we are going to learn? the logic gate. analogue and digital signal. bit and...
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WELCOME
LOGIC GATE
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.
ANALOGUE SIGNAL
DIGITAL SIGNAL
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)
BOOLEAN EXPRESSION
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.
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.
BASIC LOGIC GATE
KINDS OF LOGIC GATE
AND GATE
The “AND” element has been compared to a number of switches in series
AND GATE
TRUTH TABLE OF AND GATE
ANALOGE CIRCUIT OF AND GATE
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.
ANALOGUE CIRCUIT OF OR GATE
ANALOGUE CIRCUIT OF OR GATE
ANALOGUE CIRCUIT OF OR GATE
TRUTH TABLE OR GATE
A B C
0 0 0
0 1 1
1 0 1
1 1 1
NOT GATE
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.
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.
NAND GATE AND NOR
A B C E
0 0 0 1
1 0 0 1
0 1 0 1
1 1 1 0
A B C E
0 0 0 1
0 1 1 0
1 0 1 0
1 1 1 0
NAND GATE NOR GATE
THREE INPUT NAND GATE
Input OutputA B C Y F0 0 0 0 1
0 0 1 0 1
0 1 0 0 1
0 1 1 0 1
1 0 0 0 1
1 1 0 0 1
1 0 1 0 1
1 1 1 1 0
THREE INPUT NOR GATE
INPUT OUTPUTA B C Y F0 0 0 0 10 1 0 1 00 0 1 1 00 1 1 1 01 0 0 1 01 1 0 1 01 0 1 1 01 1 1 1 0
USES OF LOGIC GATE
• Pin out diagram of a 74266 Quad XNOR DIP-format IC
RECAPITULATION
The Logic Gate.Analogue and Digital signal.Bit and Byte.Boolean Theorem.Description and Circuit analyses of different
types of logic Gate.
QUESTION AND ANSWER
THANK YOU