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How should the minimum and maximum values of DC and AC be considered?

Latest Updated:04/01/2008

Question:

How should the minimum and maximum values of DC and AC characteristics be considered?

Answer:

The DC margin and AC margin are determined by the respective values of the output and the corresponding input. In other words, the characteristic range of the output must include that of the input. It can therefore be said that the larger the margin, the better the interface that is less likely to be affected by noise. Consequently, considering connection of a signal line, the preferable direction of the minimum and maximum values is reversed between the input and output.



The DC margin poses a problem in many cases at the high level, and a general countermeasure is to insert a buffer or to pull up by a resistor (the AC margin and current driving capability must be checked).

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