I am going to need to use an optocoupler to isolate two circuits in two situations. In both situations, a MCU GPIO will be driving the LED of the optocoupler to send a signal on the other end.
I am planning to use this optocoupler as its was the cheapest I could find that has the shorted rise/fall time. Since an MCU will be driving the LEDs, I would like very little current to be drawn on the GPIO; how do I know what is the smallest current I can drive the LED of the optocoupler?
The first circuit fastest switch frequency is 250ms the second circuit though is a bit more sensitive as it will pull low for 2ms and can have an interval as low as 0.5ms. Will this optocoupler be able to switch that fast at low LED currents?