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SN74AVC1T45: A output abnormal when there is a cap on B input

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Part Number:SN74AVC1T45

Hi team, 

My customer is using our SN74AVC1T45DRLR as a logic Level Translator. The direction is from B to A. And the issue is the A output is abnormal when there is a cap(C157) on B input. When they remove the C157, the A output is normal 1.8V. Do you have any comments here? It seems the C157 has bad effect here. But i don't konw why.

The abnormal output is as below.

The normal output is as below, 


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