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SN54SLC8T245-SEP: VDDA and VDDB

Part Number: SN54SLC8T245-SEP

Hello,

My customer has a couple of questions about VDDA and VDDB as follows.

Q1:
VDDA and VDDB are completely independent each other and they are not connected somehow internally, for example through a diode?
If ether VDDA or VDDB is ON, the other VDD stays 0V?

Q2:
No power up sequences between VDDA and VDDB at all?

Best regards,

K.Hirano