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SN74LVCH245A: Must no used terminals be opened without any pulled up/down resistor?

Part Number: SN74LVCH245A

 Hello guys,

 One of my customers is going to use SN74LVCH245A for their new products.

 At this moment, they have the following question.

 Could you give me your reply?

 Q. In case of a few bits are not used, must those bits be opened not pulled up or down with resistor?

 Your reply would be much appreciated.

 Best regards,

 Kazuya.