ADUC848BCPZ62-3 PCB Layout, VDD Peak Input question

Dear Sir,

I have two issue that Please kindly support refer below question.

1. Part NO : ADUC848BCPZ62-3

2. Application : Gas detector module

3. Status : Design In

4. Problem : At first, the memory was written well, but during operation, the updated memory data was broken.

5. Request  : 1) ADUC848 PCB Layout guide  

                     2) Peak input voltage DVDD = 3.86V (10ns during) is demage or Not?.