How many Ohms is the resister between Pin with GND when pin is set as open drain low and pin output is low?

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Anonymous
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        I want to use I/O port as a switch to control outside resister network, I find the resister between pin with GND is not 0 ohm when the I/O pin is set a open drain low and the Pin output is low.   
if I want to get a low resister near zero Ohm between pin with GND, How do I want to do?   
   
Best regards,   
David   
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MR_41
Employee
Employee
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        Hello David,   
   
Check out the below application note.   
   
    http://www.cypress.com/?rID=2798
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Anonymous
Not applicable
        Dear Ganesh,   
Thank you very much!   
   
Best Regards,   
David   
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