ISO7762-Q1: Failure mode distribution categories

Hi Florian,

Thanks for your interest in ISO7762-Q1, please see my inputs below.

Florian Giezendanner said:

In the failure mode distribution table (SLLA513 table 3-1) the first entry is 'OUT state undetermined'. Can you please clarify what type of failures are in this category?

The datasheet defines VOH and VOL specifications, any voltages outside of these specifications are referred as undetermined for this device.

Florian Giezendanner said:

My interpretation is that this covers failures where the output does not match the input, but the output is not stuck. Is this correct?

Your understanding is mostly correct. This represents a situation where output doesn't meet device devices specifications and is neither HIGH nor LOW. It cannot be referred as stuck HIGH or LOW as stuck voltages can still be within device VOH and VOL specifications.

Let me know if you have any other questions, thanks.

Regards,
Koteshwar Rao