Practice Integrated-Circuit Logic Families Multiple Choice Questions with Answers Quiz-4

Q.1.

A current-sourcing transistor may also be referred to as a pull-down transistor.

True
False

Q.2.

The data sheet for the 74 series of TTL ICs shows that V_cc has a range of 4.5 V to 5.5 V.

True
False

Q.3.

Propagation delay is important because ________.

the logic gates must be given a short break during each clock cycle or else they will overheat
it limits the maximum operating frequency of a gate
it is a measure of how long the clock must be applied to the gate before it will make the required decision
all the gates in a system must have the same propagation times in order to be compatible

Q.4.

The IEEE/ANSI notation of an internal underlined diamond denotes:

totem-pole outputs.
open-collector outputs.
quadrature amplifiers.
tristate buffers.

Q.5.

What are the major differences between the 5400 and 7400 series of ICs?

The 5400 series are military grade and require tighter supply voltages and temperatures.
The 5400 series are military grade and allow for a wider range of supply voltages and temperatures.
The 7400 series are an improvement over the original 5400s.
The 7400 series was originally developed by Texas Instruments. The 5400 series was brought out by National Semiconductors after TI's patents expired, as a second supply source.

Q.6.

What is the increase in switching speed between 74LS series TTL and 74HC/HCT (High-Speed CMOS)?

5
10
50
100

Q.7.

Logic circuits that are designated as buffers, drivers, or buffer/drivers are designed to have:

a greater current/voltage capability than an ordinary logic circuit.
greater input current/voltage capability than an ordinary logic circuit.
a smaller output current/voltage capability than an ordinary logic.
greater input and output current/voltage capability than an ordinary logic circuit.

Q.8.

Most TTL gates use the totem-pole output arrangement.

True
False

Q.9.

What is the increase in switching speed between 74LS series TTL and 74HC/HCT (High-Speed CMOS)?

5
10
50
100

Q.10.

The major advantage of CMOS logic circuits over TTL is very low power consumption.

True
False

Q.11.

________ output levels would not be a valid LOW for a TTL gate.

0.2 V
0.3 V
0.5 V
All of the above.

Q.12.

The bipolar TTL logic family that was developed to increase switching speed by preventing transistor saturation is:

emitter-coupled logic (ECL).
current-mode logic (CML).
transistor-transistor logic (TTL).
emitter-coupled logic (ECL) and transistor-transistor logic (TTL).

Q.13.

Which of the following statements apply to CMOS devices?

The devices should not be inserted into circuits with the power on.
All tools, test equipment, and metal workbenches should be tied to earth ground.
The devices should be stored and shipped in antistatic tubes or conductive foam.
All of the above.

Q.14.

A logic signal experiences a delay in going through a circuit. The two propagation delay times are defined as:

t_PLH and t_PHL.
t_DLH and t_DHL.
t_HPL and t_lph.
t_LDH and t_HDL.

Q.15.

Which of the following will not normally be found on a data sheet?

Minimum HIGH level output voltage
Maximum LOW level output voltage
Minimum LOW level output voltage
Maximum HIGH level input current

Q.16.

The fan-out of CMOS gates is frequency dependent.

True
False

Q.17.

Which of the following logic families has the highest noise margin?

TTL
LS TTL
CMOS
HCMOS

Q.18.

The dc noise margins calculated using the proper values from a standard TTL data sheet are the worst-case margins. The typical dc noise margins are usually somewhat higher.

True
False

Q.19.

The minimum input voltage recognized as HIGH by a TTL gate is ________.

2.0 V
2.4 V
0.8 V
5.0 V

Q.20.

What does ECL stand for?

It stands for electron-coupled logic; all of the devices used within the gates are N-type transistors.
It stands for emitter-coupled logic; all of the inputs are coupled into the device through the emitters of the input transistors.
It stands for emitter-coupled logic; all of the emitters of the input transistors are connected together and each transistor functions as an emitter follower.
It stands for energy-coupled logic; the input energy is amplified by the input transistors and allows the device to deliver higher output currents.

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