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Chapter 3 - Logic Gates

Terms in this set (36)

The number of input combinations for a 4-input gate is
16
When does the output of a NOR gate = 0?
Whenever a 1 is present at an input
When does the output of a NAND gate = 1?
the two inputs are unequal
A 2-input gate that can be used to pass a digital waveform unchanged at certain times and inverted at other times is a(n)
XOR Gate
If A is LOW or B is LOW or BOTH are LOW, then X is LOW. If A is HIGH and B is HIGH, then X is HIGH. These rules specify the operation of a(n)
AND Gate
A major advantage of ECL logic over TTL and CMOS is
high speed
An inverter input
is the complement of its input
A NAND gate output is LOW only if
all the inputs are HIGH.
An exclusive-OR gate output is HIGH when
the inputs are unequal.
An OR array is programmed by blowing fuses to eliminate
selected variables from the output functions.
As a rule, CMOS has the lowest power consumption of all
IC families.
The output of a NOT gate is HIGH when
the input is LOW
The output of an AND gate with three inputs, A, B, and C, is HIGH when
A = 1, B = 1, C = 1
The output of an OR gate with three inputs, A, B, and C, is LOW when
A = 0, B = 0, C = 0
If a 3-input AND gate has eight input possibilities, how many of those possibilities will result in a HIGH output?
1
With regard to an AND gate, which statement is true?
If one input to a 2-input AND gate is HIGH, the output reflects the other input.
The Boolean expression for a 3-input AND gate is
X = ABC
If a 3-input OR gate has eight input possibilities, how many of those possibilities will result in a HIGH output?
7
The Boolean expression for a 3-input OR gate is
X = A + B + C
The output of a NAND gate is LOW if
all inputs are HIGH
The output of a NOR gate is HIGH if
all inputs are LOW
If a 3-input NOR gate has eight input possibilities, how many of those possibilities will result in a HIGH output?
1
A 2-input NOR gate is equivalent to a
negative-AND gate
The output of an exclusive-OR gate is HIGH if
the inputs are unequal
The output of an exclusive-NOR gate is HIGH if
the inputs are equal
The switching speed of CMOS is now
competitive with TTL
The basic types of programmable arrays are made up of
AND gates and OR gates
One advantage TTL has over CMOS is that TTL is
not sensitive to electrostatic discharge
TTL operates from a
5-volt supply
A CMOS IC operating from a 3-volt supply will consume
less power than a TTL IC
CMOS IC packages are available in
DIP and SOIC configurations
The terms "low speed" and "high speed," applied to logic circuits, refer to the
propagation delay time
Fan-out is specified in terms of
unit loads
The number of input combinations for a 3-input gate is
8
When does the output of a NAND gate = 0?
Only when all inputs = 1
When the inputs to a 3-input NOR gate are 110, the output is
LOW
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