Digital Electronics - Logic Families and Their Characteristics

Exercise :: Logic Families and Their Characteristics - General Questions

41. 

What is the standard TTL noise margin?

A. 5.0 V
B. 0.0 V
C. 0.8 V
D. 0.4 V

Answer: Option D

Explanation:

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42. 

How can ECL have both a NOR and an OR output?

A. ECL does not have this feature.
B. They are simply the inverse of each other.

Answer: Option B

Explanation:

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43. 

Which logic family is characterized by a multiemitter transistor on the input?

A. ECL
B. CMOS
C. TTL
D. None of the above

Answer: Option C

Explanation:

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44. 

How is the speed–power product of a logic family determined?

A. The propagation delay in s is multiplied by the power dissipation in mW.
B. The propagation delay in ms is multiplied by the power dissipation in W.
C. The propagation delay in ns is multiplied by the power dissipation in mW.
D. The propagation delay in ns is multiplied by the power dissipation in W.

Answer: Option C

Explanation:

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45. 

The problem of the VOH(min) of a TTL IC being too low to drive a CMOS circuit and meet the CMOS requirement of VIH(min) is usually easily overcome by:

A. adding a fixed voltage-divider bias resistive network at the output of the TTL device
B. avoiding this condition and only using TTL to drive TTL
C. adding an external pull-down resistor to ground
D. adding an external pull-up resistor to VCC

Answer: Option D

Explanation:

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