2016-E6C: Digital ICs: Families of digital ICs; gates; Programmable Logic Devices (PLDs)
What is the function of hysteresis in a comparator?
To prevent input noise from causing unstable output signals
To allow the comparator to be used with AC input signal
To cause the output to change states continually
To increase the sensitivity
What happens when the level of a comparator's input signal crosses the threshold?
The comparator changes its output state
The IC input can be damaged
The comparator enters latch-up
The feedback loop becomes unstable
What is tri-state logic?
Logic devices with 0, 1, and high impedance output states
Logic devices that utilize ternary math
Low power logic devices designed to operate at 3 volts
Proprietary logic devices manufactured by Tri-State Devices
What is the primary advantage of tri-state logic?
Ability to connect many device outputs to a common bus
Low power consumption
High speed operation
More efficient arithmetic operations
What is an advantage of CMOS logic devices over TTL devices?
Lower power consumption
Differential output capability
Immune to damage from static discharge
Why do CMOS digital integrated circuits have high immunity to noise on the input signal or power supply?
The input switching threshold is about one-half the power supply voltage
Larger bypass capacitors are used in CMOS circuit design
The input switching threshold is about two times the power supply voltage
Input signals are stronger
What best describes a pull-up or pull-down resistor?
A resistor connected to the positive or negative supply line used to establish a voltage when an input or output is an open circuit
A resistor in a keying circuit used to reduce key clicks
A resistor that insures that an oscillator frequency does not drive lower over time
A resistor connected to an op-amp output that only functions when the logic output is false
In Figure E6-5, what is the schematic symbol for a NAND gate?
What is a Programmable Logic Device (PLD)?
A programmable collection of logic gates and circuits in a single integrated circuit
A device to control industrial equipment
Programmable equipment used for testing digital logic integrated circuits
An algorithm for simulating logic functions during circuit design
In Figure E6-5, what is the schematic symbol for a NOR gate?
In Figure E6-5, what is the schematic symbol for the NOT operation (inverter)?
What is BiCMOS logic?
An integrated circuit logic family using both bipolar and CMOS transistors
A logic device with two CMOS circuits per package
A FET logic family based on bimetallic semiconductors
A logic family based on bismuth CMOS devices
Which of the following is an advantage of BiCMOS logic?
It has the high input impedance of CMOS and the low output impedance of bipolar transistors
Its simplicity results in much less expensive devices than standard CMOS
It is totally immune to electrostatic damage
All of these choices are correct
What is the primary advantage of using a Programmable Gate Array (PGA) in a logic circuit?
Complex logic functions can be created in a single integrated circuit
Many similar gates are less expensive than a mixture of gate types
A PGA contains its own internal power supply
All of these choices are correct
● = Unseen
● = Weak
● = Review
● = Learned
● = Incorrect answer