I'm using an LMV7275MF/NOPB open-drain output comparator powered by +5V. The output is connected to the input of an FPGA using a 1k pull-up to +3.3V.
In one instance, we had the input ball on the BGA FPGA shorted to +3.3V. Therefore the output of the LMV7275 was shorted to +3.3V. It probably operated this way for many hours. After troubleshooting to find the shorted ball, then the comparator output still didn't work. I measured about 170 ohms from output to gnd, with the part removed from the PCB.
Is the open-drain output of this part supposed to be protected from a short like this? Most op-amps with push-pull output would be, but with an open-drain comparator, I don't know. The maximum short-circuit current isn't specified on the datasheet, but even nominal shows 34mA at 5V. With the output tied to 3.3V, this would be around 3.3 * 0.034 = 112mW dissipated.
Any known answers?
Thanks.