digital logic & design dr. waseem ikram lecture 06
DESCRIPTION
Digital Logic & Design Dr. Waseem Ikram Lecture 06. Recap. Logic Gates Basic Building Blocks Symbol Performs unique function Represented by a function/truth table Function expression Timing Diagram. Recap. AND Gate F=A.B OR GateF=A+B NOT Gate AND Gate enables/disables device - PowerPoint PPT PresentationTRANSCRIPT
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Digital Logic & Design
Dr. Waseem Ikram
Lecture 06
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Recap
Logic Gates Basic Building Blocks Symbol Performs unique function Represented by a function/truth table Function expression Timing Diagram
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Recap
AND Gate F=A.B OR Gate F=A+B NOT Gate AND Gate enables/disables device OR Gate car door alarm system NOT Gate 1’s complement
AF
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Recap
Alternate Symbolic representations NAND Gate NOT-AND operation Universal NAND Gate NOR Gate NOT-OR operation Universal NOR Gate
BAF
BAF
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NOR Universal Gate
Input Output
A B F
0 0 0
0 1 1
1 0 1
1 1 1
1 2
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NOR Universal Gate
31
2
Input Output
A B F
0 0 0
0 1 0
1 0 0
1 1 1
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NAND-NOR Universal Gate
31
24 3
1
2
4
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NAND Gate Applications
Device Failure Alarm
ALARM
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NOR Gate Applications
Washing Machine Controller
Switch
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XOR Gate
1 output 2 inputs Multiple inputs
=10
0
0
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XOR Gate function
Input Output
A B F
0 0 0
0 1 1
1 0 1
1 1 0
BAF
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XOR Gate Timing Diagram
t0 t4 t5 t6t1 t2 t3
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XNOR Gate
1 output 2 inputs Multiple inputs
=0
0
0
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XNOR Gate function
Input Output
A B F
0 0 1
0 1 0
1 0 0
1 1 1
BAF
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XNOR Gate Timing Diagram
t0 t4 t5 t6t1 t2 t3
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XOR Gate Applications
Detecting odd number of 1’s
1
2
3
A
B
C
D
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XNOR Gate Applications
Detecting even number of 1’s
1
2
3
A
B
C
D
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TTL/CMOS NOT Gate
+VCC
+VVo/p
Vi/p
+VDD
Vi/pVo/p
NPNTransistor N-Type
MOSFET
P-TypeMOSFET
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Type of IC Logic Gates
74XX00 Quad 2-input NAND Gate 74XX02 Quad 2-input NOR Gate 74XX04 Hex Inverter 74XX08 Quad 2-input AND Gate 74XX10 Triple 3-input NAND Gate 74XX11 Triple 3-input AND Gate 74XX20 Dual 4-input NAND Gate
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Type of IC Logic Gates
74XX21 Dual 2-input AND Gate 74XX27 Triple 3-input NOR Gate 74XX30 Single 8-input NAND Gate 74XX32 Quad 2-input OR Gate 74XX86 Quad 2-input XOR Gate 74XX133 Single 13-input NAND Gate
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Logic Gate Integrated Circuits
1 2 3 4 5 6 7
891011121314
7400Four 2-Input NAND Gate
1 2 3 4 5 6 7
891011121314
7404Hex Inverters
1 2 3 4 5 6 7
7408Four 2-Input AND Gate
891011121314
1 2 3 4 5 6 7
891011121314
7432Four 2-Input OR Gate
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Logic Gate Integrated Circuits
1 2 3 4 5 6 7
891011121314
7486Four 2-Input XOR Gate
1 2 3 4 5 6 7
891011121314
74266Four 2-Input XNOR Gate
1 2 3 4 5 6 7
7402Four 2-Input NOR Gate
891011121314
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Integrated Circuits (IC)
CMOS Complementary Metal Oxide Logic TTL Transistor-Transistor Logic ECL Emitter Coupled Logic PMOS p-channel MOS transistor NMOS n-channel MOS transistor E2CMOS
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Operational Characteristics
DC Supply Voltage Noise Margin Power Dissipation Frequency Response Fan Out