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LM25066: connect the VDD reference in parallel

Part Number: LM25066

Hi, 

When using 4 LM25066 at the same time, can we also connect the 4 VDD pin together? Since it's using for addressing, it can't be used if one is fail. 

Please let me know if there are concern to connect VDD together. 

For the address decoder, may we know about the threshold voltage? I am originally using 3.3V from external, and it can't be used. I wonder if we can use external source to provide voltage on this pin.

Thanks for your help.