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load switch suggestions: Interface product for momentary unpowered circuit

Other Parts Discussed in Thread: SN74LVC2G66, TXU0304, TXS0102, TCA9800

I am designing a battery operated system with a couple of board connected together.

To minimze power consumption, I want to turn off some sections of the system with a load switch for the power.

I have various types of IO....   1.8V / 3.3V / 5V logic, I2C, SPI  and LVDS.

I was look for some parts to disconnect the I/O and do voltage translation. So I need a couple of different parts for this I guess.

What do you recommend ?

Any tips to prevent leakage current going thru the interface  IC or their clamping diodes, etc...

Thank you !