Hi, we are using the following design to read a 24V digital signal into the RM46L430 on digital input:
Unfortunately the 3,0V-Z-diode is missed on some PCBs. On these PCBs the input of the RM46 is now driven by 4.0V. Tha means over the maximum recommended signal level but below teh aboslut maximum level. In a footnote is written, that this situation decreases the reliability of the device. Has TI done tests to determine how much the lifetime is shorten as a function of the signal level? And can Ti provide the results to us?
Thank you in advants,
Jens Greiner