Logic Families and Their Characteristics - General Questions (3)

Directions to Solve

Logic Families and Their Characteristics - General Questions

17.

When is a level-shifter circuit needed in interfacing logic?

A.	A level shifter is always needed.
B.	A level shifter is never needed.
C.	when the supply voltages are the same
D.	when the supply voltages are different

Answer: Option D

Explanation:

No answer description available for this question.

18.

What is the advantage of using low-power Schottky (LS) over standard TTL logic?

A.	more power dissipation
B.	less power dissipation
C.	cost is less
D.	cost is more

Answer: Option B

Explanation:

No answer description available for this question.

19.

The problem of interfacing IC logic families that have different supply voltages (V_CC's) can be solved by using a:

A.	level-shifter
B.	tristate shifter
C.	decoupling capacitor
D.	pull-down resistor

Answer: Option A

Explanation:

No answer description available for this question.

20.

The time needed for an output to change from the result of an input change is known as:

A.	noise immunity
B.	fan-out
C.	propagation delay
D.	rise time

Answer: Option C

Explanation:

No answer description available for this question.

21.

The output current capability of a single 7400 NAND gate when HIGH is called ________.

A.	source current
B.	sink current
C.	IOH
D.	source current of IOH

Answer: Option A

Explanation:

No answer description available for this question.

22.

The high input impedance of MOSFETs:

A.	allows faster switching
B.	reduces input current and power dissipation
C.	prevents dense packing
D.	creates low-noise reactions

Answer: Option B

Explanation:

No answer description available for this question.

23.

Totem-pole outputs ________ be connected ________ because ________.

A.	can, in parallel, sometimes higher current is required
B.	cannot, together, if the outputs are in opposite states excessively high currents can damage one or both devices
C.	should, in series, certain applications may require higher output voltage
D.	can, together, together they can handle larger load currents and higher output voltages

Answer: Option B

Explanation:

No answer description available for this question.

24.

The problem of different current requirements when CMOS logic circuits are driving TTL logic circuits can usually be overcome by the addition of:

A.	a CMOS inverting bilateral switch between the stages
B.	a TTL tristate inverting buffer between the stages
C.	a CMOS noninverting bilateral switch between the stages
D.	a CMOS buffer or inverting buffer

Answer: Option D

Explanation:

No answer description available for this question.

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