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LSF0108-Q1: Interconversion of 1.8V and 5V CMOS levels,Rpu resistance

Part Number: LSF0108-Q1


The conversion between 1.8V and 5V CMOS levels, If the IC output is all push-pull structure, is the resistor Rpu necessary?

8-channel, what do you do with dangling channels?Do not connect?