Logic Families – Exercise – 1

36. Ten TTL loads per TTL driver is known as:

(a) noise immunity
(b) fan-out
(c) power dissipation
(d) propagation delay

Answer
Answer : (b)
Explanation
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37. If all inputs to a TTL NAND gate are low, what is the ON, OFF condition of each transistor in the circuit?

(a) Q1-ON, Q2-OFF, Q3-ON, Q4-OFF
(b) Q1-ON, Q2-ON, Q3-OFF, Q4-OFF
(c) Q1-OFF, Q2-OFF, Q3-ON, Q4-ON
(d) Q1-OFF, Q2-ON, Q3-OFF, Q4-ON

Answer
Answer : (a)
Explanation
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38. 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
Answer : (a)
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39. The most common TTL series ICs are:

(a) E-MOSFET
(b) 7400
(c) quad
(d) AC00

Answer
Answer : (b)
Explanation
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40. What is the difference between the 54XX and 74XX series of TTL logic gates?

(a) 54XX is faster.
(b) 54XX is slower.
(c) 54XX has a wider power supply and expanded temperature range.
(d) 54XX has a narrower power supply and contracted temperature range.

Answer
Answer : (c)
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