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Suresh R
02/23/06 22:26
Read: 557 times

#110645 - IOL = 10mA or 1.6mA? in port 1
Responding to: Kai Klaas's previous message
suresh said:

Doubt: Does that mean that p1.x could sink 10 mA when kept low.
So, i would like to know what does this IOL = 10mA signify.

Kai Klaas said:

The term "IOL" has a very certain meaning in datasheets. It means, that if the output is low, concretely spoken if the NMOS-FET of output stage is turned-on and the PMOS-FET is turned-off, that then a current of up to 10mA is allowed to flow into the output pin, through the NMOS-FET and finally to ground.

But the datasheet also says that IOL = 1.6mA at .45 V max (VOL)
So iam confused of which value of IOL should be taken when the output is low.

i.e., when the output of p1.x = 0 , (made to logic 0 in the SFR of port1)
Then IOL of p1.x = 1.6 mA or 10 mA?
Kindly let me know for any reasons in choosing a particular IOL value out of the two.

Thanking you ,

List of 19 messages in thread
AT89s52 Port pin clarifications:      Suresh R      02/16/06 02:14      
   nice copy, where is the question      Erik Malund      02/16/06 06:30      
   output characteristics      Jan Waclawek      02/16/06 06:53      
      most confusing post      Jez Smith      02/16/06 07:34      
   Answers      Kai Klaas      02/16/06 10:35      
      Logic 1 to 0 transition      Suresh R      02/17/06 05:01      
         You haven't read the 'bible' chapter...      Kai Klaas      02/17/06 08:38      
            no details about transition from logic 1      Suresh R      02/18/06 03:27      
               other way 'round      Jan Waclawek      02/18/06 04:21      
               There ARE!!      Kai Klaas      02/18/06 06:54      
                  pFET2      Suresh R      02/19/06 07:29      
                     Weak and very weak pull-ups      Kai Klaas      02/20/06 07:19      
      maintaining low source impedence?      Suresh R      02/20/06 03:39      
         by making thje driver a sink............      Abhishek Singh      02/21/06 10:02      
         Pull-downs create problems      Kai Klaas      02/22/06 08:00      
            Maximum IOL per port pin: 10 mA ?      Suresh R      02/23/06 04:43      
               IOL      Kai Klaas      02/23/06 06:22      
                  IOL = 10mA or 1.6mA? in port 1      Suresh R      02/23/06 22:26      
                     Depends on load      Kai Klaas      02/25/06 07:40      

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