Logic Gates
How many two-input NAND gates are required to produce a two-input exclusive OR gate?
4
Which of the following could be a Boolean expression for a three-input or gate?
A+B+C=Y
Which of the following is sometimes referred to as the "all or nothing" gate?
AND
If a National Semiconductor digital DIP IC had the number 74HC08N printed on the top, what type of component would it be?
CMOS
Which family of digital ICs uses parts comparable to IGFETs?
CMOS
It is uncommon for logic functions to be programmed using software
FALSE
NAND gates are not as widely use as are other logic gates
FALSE
The AND gate is sometimes called the "any or all" gate
FALSE
The Boolean expression is a universal language used by engineers and technician in analog electronics
FALSE
The basic building block of any digital circuit is a flip-flop
FALSE
The bubble at the input of in inverter indicates that the active state is high
FALSE
The exclusive NOR gate is sometimes referred to as the "off but not even" gate
FALSE
The unique output of the NAND function is a low output only when all inputs are low.
FALSE
Which type gate is generally more widely available than any other gate?
NAND
This is an alternative logic symbol for what type of gate?
NOR
This is the logic symbol for a(n)
NOT gate (inverter)
ICs that are much smaller and have shorter pins bent to be soldered to the traces on the top of a PC board are commonly called _____ packages.
SMT
A pull-down resistor is often attached to the input of a gate in order to pull the input to the gate low when input switch is open
TRUE
Floating inputs on CMOS ICs can harm the IC
TRUE
Invert bubbles at the input of the AND gate convert it into a NOR function.
TRUE
Manufacturers' data manuals include traditional logic symbols and are recently including the newer IEEE functional logic symbols.
TRUE
Positive logic is most often used in digital electronics
TRUE
The CMOS family is a very low power and widely used family of digital ICs
TRUE
The NOR gate is not the same as the OR gate in operation
TRUE
The NOT circuit has one input and one output
TRUE
The terms negated, complemented, and inverted mean the same thing
TRUE
The unique characteristic of the XOR gate is that it produces a high output only when an odd number of high inputs are present
TRUE
The unique output of the AND function is a high output only when all inputs are high
TRUE
When using 4000 series CMOS, what is the pin labeled that is connected to the positive of the power supply?
VDD
This is the logic symbol for what type of gate?
XOR
In practical electronic equipment most digital ICs are mounted on
a printed circuit board
The noninverting _____ serves no logical purpose, but is used to supply greater drive current at its output.
buffer
Which logic gate provides a low output only when an odd number of inputs are high?
exclusive NOR
A logic _____ is a circuit that can decide to say yes or no at the output based upon inputs.
gate
The NOT circuit is another name for a(n) _____.
inverter
Boolean algebra is the algebra of _____.
logic
The unique output from the NOR gate is _____ only when all inputs are _____.
low, high
The letters LS in the core part number of a 7400 series IC stand for
low-power Schottky
The little invert bubble on the right end of a logic symbol means to invert the _____.
output
On a logic probe, the _____ lead is connected to the positive (+) of the power supply.
red
If caution is not exercised, CMOS ICs can be damaged by
static charges
The _____ for a gate gives all the possible input combinations and the resulting outputs.
truth table
The first step in troubleshooting should be to
use your senses
