ESR of ADuM5000 output pin

Hey, I am using the ADuM5000 for a project and I want to limit the voltage of the output (secondary side) during the startup to 5V in order to protect components being powered by it. I want to use a zener diode as suggested in the datasheet (page 12) and for that, I would like to know the equivalent series resistance and capacitance if possible of the output(Viso pin).

Thanks in advance,