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SN74AVC16T245: Power Calculations

Part Number: SN74AVC16T245

SN74AVC16T245
1) page no 5 of datasheet: here it is written contineous current through each Vcca, Vccb and GND; since it contains 2 Vcca , 2 Vccb and 8 GND. So, what should be total current rating for purpose of power calculation.
2) what is the value of resistance in directional circuit for Vin 1.8V (as it is not mentined anywhere)