Is it allowed to supply the ADG5413 with 5V when all switches only have to remain open (high impedance)?
During this device state the inputs off the ADG5413 will be 2.5V +- 0.3V
When the ADG5413 is switching, it's supply will be >=9V (Minimal listed single supply voltage).
The 5V supply is required during the state where the ADG5413 only has to remain high impedance due to single fault safety of a medical device.
A alternative is using the ADG5413F because quoting from the datasheet:
The ADG5413F is considerable more expensive though. Since I need 12 of these muxes per device, this would add quite a lot to the cost price. Also the over voltage protection of the ADG5413F is not required.