Digital isolator tolerant ADuM1400

Hi Syvalion, 

Applying 5V to an input pin would violate the ADuM1400's absolute max ratings (−0.5 V to VDDI + 0.5 V in Table 13).

The ADuM1400 has ESD protection diodes on all input and output pins. A 5V signal on any of those pins will backfeed to the VDD rail, and may cause unexpected operation. 

MAX22444 is pin-compatible with the ADuM1400 and has a different ESD structure. That one will not backfeed the VDD rail, so a 5V signal could be applied while the isolator is unpowered. 

Regards,

Jason 

Hi Syvalion, 

Applying 5V to an input pin would violate the ADuM1400's absolute max ratings (−0.5 V to VDDI + 0.5 V in Table 13).

The ADuM1400 has ESD protection diodes on all input and output pins. A 5V signal on any of those pins will backfeed to the VDD rail, and may cause unexpected operation. 

MAX22444 is pin-compatible with the ADuM1400 and has a different ESD structure. That one will not backfeed the VDD rail, so a 5V signal could be applied while the isolator is unpowered. 

Regards,

Jason 

Hi  Jason,

Thank you for the advice.

I understand about the max rating of ADuM1400.

Thanks for the introduction of MAX22444. I will consider adopting this isolator.

Regards,

SYVALION