Select topics and difficulty and just practice mcqs.
Circuit Logic Families
Industrial Engineering and Production Management
Strength of Materials
Theory of machines
User (name or email)
pick difficulty level
number of questions
Let's practice 30 mcqs on
Circuit Logic Families
mcqs by everyone
Several manufacturers have developed logic that combines the best features of TTL andCMOS.
This is called ________
Which of the following logic families has the highest maximum clock frequency
________ TTL allows three possible output states
The number of gates that can be connected to a single output without exceeding the current ratings of the gate is called ________
The propagation delay of standard TTL gates is approximately ________
Which of the following logic families has the highest noise margin
What causes low-power Schottky TTL to use less power than the 74XX series TTL
Using NAND gates
Nothing. The 74XX series uses less power.
A larger value resistor
The Schottky-clamped transistor
The ________ is defined as the maximum number of standard logic inputs that an output can drive reliably
Refer the givenfigure.
Which of the following describes the operation of the circuit
A LOW input turns Q1 and Q4 off; Q2 and Q3 are on.
A LOW input turns Q1 and Q3 on; Q2 and Q4 are off.
A HIGH input turns Q1, Q2, and Q3 off, and Q4 is on.
A HIGH input turns Q1, Q2, and Q4 on; Q3 is off.
Fan-out for a typical TTL gate is ________
The 74F-Fast TTL integrated-circuit fabrication technique uses reduced interdevice ________ to achieve reduced propagation delays
The power dissipation of a CMOS IC will ________
increase with frequency
decrease with gate size
decrease with frequency
increase with gate size
When the output of a standard TTL gate is HIGH, it can ________
sink a maximum of 400 A from no more than 10 load gates
source 16 mA of current to no more than 10 attached gates
sink 16 mA of current from the attached input gates
source 400 A of current to no more than 10 attached gates
What is the increase in switching speed between 74LS series TTL and 74HC/HCT (High-Speed CMOS)
A logic probe is placed on the input of a digital circuit and the probe lamp blinks slowly, indicating ________
a high-frequency pulse train
that an open or bad logic level exists
a high level output
that the supply voltage is low
Which of the following will not normally be found on a data sheet
Maximum HIGH level input current
Maximum LOW level output voltage
Minimum HIGH level output voltage
Minimum LOW level output voltage
Refer to the givenfigure.
What type of output arrangement is being used for the output
What are the major differences between the 5400 and 7400 series of ICs
The 5400 series are military grade and allow for a wider range of supply voltages and temperatures.
The 5400 series are military grade and require tighter supply voltages and temperatures.
The 7400 series are an improvement over the original 5400s.
The lower transistor of a totem-pole output is saturated when the gate output is ________
The minimum input voltage recognized as HIGH by a TTL gate is ________
Whenever a totem-pole TTL output goes from LOW to HIGH, a high-amplitude current spike is drawn from the Vccsupply.
How is this effect corrected to a digital circuit
By using a switching power supply
By connecting a capacitor from Vout to ground
By connecting a radio-frequency capacitor from Vcc to ground.
By connecting a large resistor from Vcc to Vout
The HIGH logic level for a standard TTL output must be at least ________
When VGS = 0 on an N-channel MOSFET switch, there is no ________ between the source and the drain
Logic circuits that are designated as buffers, drivers, or buffer/drivers are designed to have
a smaller output current/voltage capability than an ordinary logic.
a greater current/voltage capability than an ordinary logic circuit.
greater input current/voltage capability than an ordinary logic circuit.
greater input and output current/voltage capability than an ordinary logic circuit.
The proliferation of small handheld consumer equipment such as digital video cameras, cellular phones, handheld computers (________), portable audio systems, and other devices has created a need for logic circuits in very small packages
What type of circuit is shown below and which statement best describes its operation
It is a hybrid TTL-CMOS inverter with FET totem-pole output.
It is a two-input CMOS buffer with tristate output.
It is a CMOS inverter with tristate output.
It is a two-input CMOS AND gate with open drain.
Generally, the voltage measured at an unused TTL input would typically be measured between
0 to 1.8 V.
1.4 to 1.8 V.
0 to 5 V.
0.8 to 5 V.
One advantage that MOSFET transistors have over bipolar transistors is ________
reduced propagation delay
low input impedance
higher switching speed
high input impedance
A logic signal experiences a delay in going through acircuit.
The two propagation delay times are defined as
tHPL and tlph.
tDLH and tDHL.
tPLH and tPHL.
tLDH and tHDL.
The IEEE/ANSI notation of an internal underlined diamond denotes
we serve best when javscript is enabled