Part Number: SN74LVC2G17
We have a design using the SN74LVC2G17DCK with +3V3 supply as logic level converer from nom. +5V input signals (inputs 1A, 2A) to +3V3 signals. For protection and as input low pass filter there is a 10k series resistor between the external input and the input of the buffer-gate (1A, 2A) and a 100nF ceramic cap between gate input and GND. One customer would like to apply higher voltages - e.g. 12V or even 24V to the external input. This is - of course - higher than the specified +6.5V abs. max. in the datasheet - nevertheless, the data sheets also mentions, that "voltage ratings may be exceeded, if the input current ratings are observed". This said, there is a negative input current limit specified (negative input voltages) - but, no positive current limit into the inputs (which would probably happen with higher positive input supply voltages). As the datasheet also includes ESD ratings for the inputs I would assume some protection also for higher input voltages. Also, we already did some tests with the device and 24V - current limited - does not seem to damage the device (at least not for the test duration of a few days). Is it possible to operate the device with 24V at the input - current limited - or is this not reliable and the device most probably will get damaged after some weeks / months ?
Thanks in advance for your help.