Question
Download Solution PDFWhich of the following IC logic families has the highest fan-out?
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFWhile choosing a particular digital IC for an application, its specifications or characteristics should be taken into account.
The main specifications for logic families are as follows:
Fan-in: The number of inputs that can be connected to a logic gate is called its ‘Fan-in’.
Fan-out: The number of units that can be connected to the output of a logic gate is called its ‘Fan-out’.
CMOS has the highest fan-out among the given logic families.
A comparison of the given logic families is as shown:
|
|
TTL |
ECL |
CMOS |
|
Fan-In |
12-14 |
> 10 |
> 10 |
|
Fan-Out |
10 |
25 |
50 |
|
Power Dissipation (mW) |
10 |
175 |
0.001 |
|
Noise Margin |
0.5 V |
0.16 V (lowest) |
1.5 V (Highest) |
|
Propagation Delay (ns) |
10 |
< 3 (lowest) |
50 (Highest) |
|
Noise Immunity |
Very good |
Good |
excellent |
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