Gates
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Ahmad Bilal - DLD
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Logic Gates
• Basic Building Blocks• Logic Gate Symbol• Unique function• Truth or Function Table• Function Expression• Timing Diagram
AND Gate
• 1 output• 2 inputs• 3 inputs• 4 inputs• Multiple inputs
&0
0
0
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AND Gate function
• Logical Multiplication function
BAF NCBAF ....
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AND Gate Timing Diagram
t0 t4 t5 t6t1 t2 t3
A
B
F
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Practice Task. Make a Timing Diagram of And Gate when
A = 0100011B=1101010
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Question for Class How can Safety Be added
to Industry ( Let say) Drilling Machine , using
gates ?
OR Gate
• 1 output• 2 inputs• 3 inputs• 4 inputs• Multiple inputs >=10
0
0
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OR Gate function
• Boolean Add function
BAF NCBAF ..
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OR Gate Timing Diagram
t0 t4 t5 t6t1 t2 t3
A
B
F
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Can you Help me Develop a Security System for my house, so that when
any door opens, I get a Alarm
OR Gate Applications
• Car door open alarm
Alarm
Front left door
Rear left door
Front right door
Rear right door
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NOT Gate
• 1 input• 1 output
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NOT Gate function
AA
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NOT Gate Timing Diagram
t0 t4 t5 t6t1 t2 t3
A
F
NOT Gate Applications
• 1’s Complement
1 1 1 1
1 1 1 1
0 0
0 0
0
0 0
0
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NAND Gate
• 1 output• 2 inputs• 3 inputs• 4 inputs• Multiple inputs
&0
0
0
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NAND Gate function
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BAF
CAN STUDENT DEVELOP EQUATION FOR NAND GATE !!!!
Remember Its AND with NOT
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NAND Gate Timing Diagram
t0 t4 t5 t6t1 t2 t3
A
B
F
NAND Gate Applications
• Device Failure Alarm
ALARM
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NOR Gate
• 1 output• 2 inputs• 3 inputs• 4 inputs• Multiple inputs
>=10
0
0
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NOR Gate function
• NOT-OR function
BAF
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XOR Gate
• 1 output• 2 inputs• Multiple inputs
=10
0
0
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XOR Gate function
BAF
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XOR Gate Timing Diagram
t0 t4 t5 t6t1 t2 t3
XOR Gate Applications
• Detecting odd number of 1’s
1
2
3
A
B
C
D
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XNOR Gate
• 1 output• 2 inputs• Multiple inputs
=0
0
0
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XNOR Gate function
Input OutputA B F0 0 10 1 01 0 01 1 1
BAF
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XNOR Gate Timing Diagram
t0 t4 t5 t6t1 t2 t3
XNOR Gate Applications
• Detecting even number of 1’s
1
2
3
A
B
C
D
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