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LM293: Definition and conditions for Maximum Output Voltage

Part Number: LM293

Dear Engineers,

This question can apply to most comparators not just this one. I have a circuit where when the output is held high, it is held in an open circuit state as an open pin. So there is no current flowing through the device and being sourced through the pin. Does the maximum output voltage as stated in the datasheets apply to scenarios only when current is being sourced at the high state or if the voltage on the output pin exceeds the maximum voltage levels with no current (only electrostatic force), will the chip be destroyed? Once the output goes low, voltage comes down immediately into normal operating conditions through the pin. To put some real numbers here, I have two comparators where a relay is attached one end to Vcc and the other end to the output pin of the first comparator. There is also a resistor equal in value to the DC resistance of the relay coil attached to this output pin and the output pin of the second comparator. The first comparator is attached to Vcc and GND. The second comparator is attached to GND and Vss. Vcc is 32 volts, Vss is -32 volts. So you see when the comparator is held high there is 64 volts of electrostatic potential on the output pin of the second comparator but no current is being sourced. If the first comparator goes low, it goes low to about GND. If the second comparator goes low, voltage on the first comparators pin goes to about GND and voltage on the second comparator's pin goes to about -Vss.

Is this Scenario safe for the chip? Please see attached. 6685.Comparator Circuit.pdf