16
|
Describe
the advantages and disadvantages of totem – pole output of the TTL logic IC.
|
Advantages
Disadvantages
|
|
17
|
Explain the term : Current sinking and
Current sourcing transistor
|
Current sinking
transistor
Current sourcing
transistor
|
|
18
|
At which state the TTL acts as current
sinking and current source?
|
The TTL acts as current sinking in LOW state whereas
current source in HIGH state.
|
|
19
|
Explain the term : Unit load
|
Unit load
|
|
20
|
Which type of output does the TTL
consists of?
|
The output of the TTL may consist of either open
collector or totem – pole.
|
|
21
|
Explain the term : Passive pull up
|
Passive pull up
|
|
22
|
Why the totem – pole TTL is faster
than the open collector TTL logic?
OR
Why the open collector TTL logic is
not suitable for fast switching speed application?
|
The output of the open collector TTL is slower than
the totem pole TTL because the load capacitance of the open collector TTL
charges through with large time constant.
|
|
23
|
What is wired AND operation of the
TTL? What is its purpose?
|
Wired AND operation
|
|
24
|
Why the wired AND operation cannot be
done in the totem – pole TTL?
|
Wired AND operation
|
|
25
|
In which type of output, the wired AND
operation is possible in the TTL?
|
Open collector TTL gates
|
|
26
|
Describe the disadvantage of wired AND
operation of TTL.
|
The wired AND operation of TTL reduce switching
speed due to absence of pull up transistors.
|
|
27
|
Explain the term : Tri state TTL
|
Tri state TTL
|
|
28
|
What are the three output states of
the tri – state TTL?
|
The tri state of the TTL output are : HIGH, LOW and
HIGH impedance
|
|
29
|
Describe the advantage of the tri –
state configuration of the TTL.
|
Advantage of tri – state configuration
|
|
30
|
Explain the term : Buffer / Driver
|
Buffer / Driver
|
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