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I understand that the absolute Max rating of LM2903-Q1's input voltage is -0.3 V on the negative voltage side. However, I'm wondering whether -1 V is tolerable if the current that flows through the pin (either IN+ or IN-) is 0.1 mA or smaller. In the system, -1 V could be applied to IN- pin, but the current flow will be as low as 0.1 mA.
Best regards, Shinichi Yokota
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TI Comparators (CMPS) Applications Group
In reply to Paul Grohe:
In reply to Steve Widener:
None of the devices in our comparator portfolio will handle input voltages below their negative supply pin.
Most will accept a voltage slightly below V-, down to -0.3V is generally acceptable.
Most of the newer devices have ESD protection on the inputs that clamp to the supplies. But the older devices, like the LM2903 family, do not have ESD diodes, and negative voltages will reverse bias the internal die junctions and do "bad things".
If negative voltage is expected, a external resistor and external clamp diode should be used. Schottky's are recommended since they have a lower forward voltage (0.3 to 0.4V) and will conduct earlier than the internal junctions (0.6 to 0.8V) and take the brunt of the current.
Keep in mind that comparators do not need absolute voltage levels. They are just comparing voltages. If you have negative voltages, it is possible to use level-shifting (pull-up) resistor networks to bring the trip points up to legal positive values.
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