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ISO7241C: Is the default status of INB high if I leave it floating?

Part Number: ISO7241C

Hi,

I am designing my circuit with ISO7241C. I want pass OSS signal from external MCU to TPS2388 device and the OSS pin is internally pulled down to GND. When I use ISO7241 to pass this signal, I found that if I left the INB open(without pull up or pull down resistor), the INB is high. Is the internal circuit of ISO7241 make that pin high? If I want the default status of OSS is low without any MCU controlled, should I add a pull down resistor? Thanks. 

Best regards,

Penny