Hello Team,
I'm posting on behalf of my customer:
I have a product that is failing the ICT unpowered test. I need to know what the unpowered resistance is for a SN74LVC1G97DCKT. Pin 4 to ground and Pin 6 to ground including +/- tolerance.
I think the test tolerance is too tight but I need this data to confirm it.
Regards,
Renan
Hi Renan,
The device specifies the minimum input and output resistance indirectly through the off-state leakage specification:
You could measure resistance and look for the minimum value R = 5.5 V / 10uA = 550 kΩ, however I would recommend a simpler test.
For in-circuit testing, apply 0V to the supply of the device, apply 5.5V to the input or output and measure current at the pin under test. The device fails if the current exceeds 10 uA.
This specification is provided for the entire temperature range of the device, so if you're only testing at 25C, you can expect a much lower value than the provided limit (leakage increases exponentially with temperature).
I would recommend setting 25C test limits to +/- 1uA, as that should still be a large leakage current for the device at 25C, and if any device exceeds that value, I would expect it to have been damaged.
You can, of course, test beyond the limits provided by TI (for example, looking for 100nA or less), but TI will not guarantee operation outside the datasheet specifications.
Please take note that these are values only for this device - if doing in-circuit testing, you will likely have other components connected that will affect the test.
