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Is there a problem if IC relay operates which imposed by the noise?

Latest Updated:02/01/2008

Question:

Noise is superimposed onto the clock input to an IC when a relay operates.
It seems that the IC is operating correctly. Is there any problem? If a problem occurs, how does the IC behave?

Answer:

Since a relay can be a source of electromagnetic waves (surge noise), precautions must be taken to protect the IC from the electromagnetic waves.
The behavior of the IC if the input clock is disturbed cannot be predicted. (The clock waveform does not satisfy the specifications, because a level width and transition time are defined.)
The noise component that exceeds the absolute maximum ratings could promote degradation of the IC and affect its reliability.
Noise affects not only the clock but also the other signals. Therefore, drastic action must be taken to improve the relay circuit itself.
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