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TPS549B22: NC pins

Part Number: TPS549B22
Other Parts Discussed in Thread: TPS549D22


For the pin 27 datasheets specify Not Connect on 549B22 and 549C22.
Additionally, the 549B22 datasheet has the pins 26,6and 7 Not Connect.
The 549B22 EVM layout has these pins floating.

Must these pins be left floating or can they be connected to the adjacent pins?

The question relates to drop-in capability on the same PCB of the two versions, 549B22 and 549C22 (for the pins 6,7 and 26) and for layout purposes (pin 27)

Thank you