Digital Electronics - Logic Families and Their Characteristics

Exercise :: Logic Families and Their Characteristics - General Questions

21. 

The term buffer/driver signifies the ability to provide low output currents to drive light loads.

A. True
B. False

Answer: Option B

Explanation:

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22. 

PMOS and NMOS ________.

A. represent MOSFET devices utilizing either P-channel or N-channel devices exclusively within a given gate
B. are enhancement-type CMOS devices used to produce a series of high-speed logic known as 74HC
C. represent positive and negative MOS-type devices, which can be operated from differential power supplies and are compatible with operational amplifiers
D. None of the above

Answer: Option A

Explanation:

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23. 

Why is the operating frequency for CMOS devices critical for determining power dissipation?

A. At low frequencies, power dissipation increases.
B. At high frequencies, the gate will only be able to deliver 70.7 % of rated power.
C. At high frequencies, charging and discharging the gate capacitance will draw a heavy current from the power supply and thus increase power dissipation.
D. At high frequencies, the gate will only be able to deliver 70.7 % of rated power and charging and discharging the gate capacitance will draw a heavy current from the power supply and thus increase power dissipation.

Answer: Option C

Explanation:

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24. 

Ten TTL loads per TTL driver is known as:

A. noise immunity
B. fan-out
C. power dissipation
D. propagation delay

Answer: Option B

Explanation:

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25. 

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:

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