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Chapter 4 - Gates and Circuits
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Terms in this set (40)
Gate
A device that performs basic operations on electrical signals
Circuits
Gates combined to perform more complicated tasks
Boolean Expression
Uses Boolean algebra a mathematical notation for expressing two-valued logic
Logic diagrams
A graphical representation of a circuit; each gate has its own symbol
Truth tables
A table showing all possible input values and the associated output values
Types if Gates
NOT, AND, OR, XOR, NAND, NOR
NOT Gate
accepts one input signal (0 or 1) and returns the opposite signal as output
AND Gate
accepts two input signals. If both are 1, the output is 1; otherwise, the output is 0
OR Gate
accepts two input signals. If both are 0, the output is 0; otherwise, the output is 1
XOR Gate
accepts two input signals. If both are the same, the output is 0; otherwise, the output is 1
NAND Gate
accepts two input signals. If both are 1, the output is 0; otherwise, the output is 1
NOR Gate
accepts two input signals. If both are 0, the output is 1; otherwise, the output is 0
Transistor
A device that acts either as a wire that conducts electricity or as a resistor that blocks the flow of electricity, depending on the voltage level of an input signal
Combinational circuit
The input values explicitly determine the output
Sequential circuit
The output is a function of the input values and the existing state of the circuit
Circuit equivalence
Two circuits that produce the same output for identical input
Addition operations are carried out by special circuits called, appropriately...
adders
Half adder
A circuit that computes the sum of two bits and produces the correct carry bit
Full adder
A circuit that takes the carry-in value into account
Multiplexer
A circuit that uses a few input control signals to determine which of several output data lines is routed to its output
Integrated circuits are classified by the number of gates contained in them
True
The NOR gate produces the opposite results of the XOR gate.
False
The output of an OR gate when one input is 0 and one input is 1 is 0.
False
Boolean expressions are more powerful than logic diagrams in expressing the processing of gates and
circuits.
False
A full adder takes the carry-in value into account.
True
Produces a 1 only if all its inputs are 1 and a 0 otherwise.
AND Gate
Produces a 0 only of its inputs are the same and a 1 otherwise.
XOR Gate
How many transistors does it take for a NOR gate?
2
X = A * B
AND Gate Symbol
X = A + B
OR Gate Symbol
X = A (+) B
XOR Gate Symbol
X= A*B'
NAND Gate Symbol
X= A+B'
NOR Gate Symbol
X = A'
NOT Gate Symbol
NOT Gate Diagram
AND Gate Diagram
NAND Gate Diagram
OR Gate Diagram
NOR Gate Diagram
XOR Gate Diagram
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