ISO7742: configuring input pin for unused channels

Hello,

Thank you for your Inquiry.

For unused input pins on digital isolators, it is best to keep them connected in a way to maintain the default state, which allows for lower current consumption and helps the device be more immune to noise.

For example, The ISO7742F has a default LOW state. Unused pins can be connected to ground to maintain the default LOW state. The ISO7742 device (no F suffix) has a default HIGH state. unused pins for the non-F model can be connected to a pull-up resistor (typically 4.7kohm) to maintain the default state.

For more information on unused channel input/output pins, please refer to this FAQ: https://e2e.ti.com/support/isolation-group/isolation/f/isolation-forum/732667/faq-can-channel-input-output-pins-on-a-digital-isolator-be-left-floating

Regards,
Aaditya V