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http://www.nxp.com/documents/data_sheet/PCF8575.pdf

Can somebody tell me which parameter one should look for while looking for calculating maximium Current source/sinked by a pin.

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The output current is listed as IOL and IOH:

PC8575 output current

Please note that these are the values that guarantee not to exceed the specified voltage drop (VOL, VOH). If you need a smaller voltage drop, you need to use a smaller current. (See also What is drive strength a measurement of?)

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