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PCF8574 (I2C expander) - Output voltage?



Hello - Does anyone know, or can measure?, what the voltage is on the P0-P7 pins when the output is active, ie sinking 20mA?   I'm trying to work out the value of a load-limiting resistor, and need to know that voltage!

In the datasheet, a value of 1v is mentioned as one of the test conditions for IOL but is that part of the spec, and reliable?

Thanks,