Logic Families – Exercise – 1

26. The word “interfacing” as applied to digital electronics usually means:

(a) a conditioning circuit connected between a standard TTL NAND gate and a standard TTL OR gate
(b) a circuit connected between the driver and load to condition a signal so that it is compatible with the load
(c) any gate that is a TTL operational amplifier designed to condition signals between NMOS transistors
(d) any TTL circuit that is an input buffer stage

Answer
Answer : (b)
Explanation
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27. 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
Answer : (d)
Explanation
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28. How many 74LSTTL logic gates can be driven from a 74TTL gate?

(a) 10
(b) 20
(c) 200
(d) 400

Answer
Answer : (b)
Explanation
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29. Can a 74HCMOS logic gate directly connect to a 74ALSTTL gate?

(a) Yes
(b) No Answ
(c)
(d)

Answer
Answer : (a)
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30. 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
Answer : (b)
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