Integrated-Circuit Logic Families - General Questions (3)

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Integrated-Circuit Logic Families - General Questions

17.

What type of circuit is represented in the given figure, and which statement best describes its operation?

mcq8_1012_1

A.	It is a tristate inverter. When the ENABLE input is HIGH, the output is effectively an open circuitâ€”it is neither LOW nor HIGH.
B.	It is a programmable inverter. It can be programmed to function as either an active LOW or an active HIGH inverter.
C.	It is an active LOW buffer, which can be turned on and off by the ENABLE input.
D.	None of the above.

Answer: Option A

Explanation:

No answer description available for this question.

18.

What type of circuit is shown below, and how is the output ordinarily connected?

mcq8_1011_1

A.	It is an open-collector gate and is used to drive loads that cannot be connected directly to Vcc due to high noise levels.
B.	It represents an active-LOW inverter and is used in negative logic systems.
C.	It is an open-collector gate. An external load must be connected between the output terminal and an appropriate supply voltage.
D.	Any of the above could be correct, depending on the specific application involved.

Answer: Option C

Explanation:

No answer description available for this question.

19.

What is the static charge that can be stored by your body as you walk across a carpet?

A.	300 volts
B.	3,000 volts
C.	30,000 volts
D.	Over 30,000 volts

Answer: Option D

Explanation:

No answer description available for this question.

20.

What must be done to interface CMOS to TTL?

A.	A dropping resistor must be used on the CMOS 12 V supply to reduce it to 5 V for the TTL.
B.	As long as the CMOS supply voltage is 5 V, they can be interfaced; however, the fan-out of the CMOS is limited to two TTL gates.
C.	A 5 V Zener diode must be placed across the inputs of the TTL gates in order to protect them from the higher output voltages of the CMOS gates.
D.	The two series cannot be interfaced without the use of special interface buffers designed for that purpose, such as the open-collector buffers.

Answer: Option B

Explanation:

No answer description available for this question.

21.

Which of the following statements apply to CMOS devices?

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

Answer: Option D

Explanation:

No answer description available for this question.

22.

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

A.	The 5400 series are military grade and require tighter supply voltages and temperatures.
B.	The 5400 series are military grade and allow for a wider range of supply voltages and temperatures.
C.	The 7400 series are an improvement over the original 5400s.
D.	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.

Answer: Option B

Explanation:

No answer description available for this question.

23.

What causes low-power Schottky TTL to use less power than the 74XX series TTL?

A.	The Schottky-clamped transistor
B.	Nothing. The 74XX series uses less power.
C.	A larger value resistor
D.	Using NAND gates

Answer: Option C

Explanation:

No answer description available for this question.

24.

What must be done to interface TTL to CMOS?

A.	A dropping resistor must be used on the CMOS 12 V supply to reduce it to 5 V for the TTL.
B.	As long as the CMOS supply voltage is 5 V, they can be interfaced; however, the fan-out of the TTL is limited to five CMOS gates.
C.	A 5 V Zener diode must be placed across the inputs of the TTL gates in order to protect them from the higher output voltages of the CMOS gates.
D.	A pull-up resistor must be used between the TTL output-CMOS input node and Vcc; the value of RP will depend on the number of CMOS gates connected to the node.

Answer: Option D

Explanation:

No answer description available for this question.

Integrated-Circuit Logic Families - General Questions (3)

Integrated-Circuit Logic Families - General Questions

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