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LT1677 (NC) pin connection

Hello,

I would like to use NC pin.5 of LT1677 for a guard ring (tied to Vin-). In data sheet this pin is marked as NC, but

it is not clear if this pin is floating or in some way tied to die. This will help me with more optimal routing , since I 

have very tight space and multiple of LT1677.

Thanks for any info.