Email: Password: Remember Me | Create Account (Free)


 

Back to Subject List

Old thread has been locked -- no new posts accepted in this thread
Jacob Boyce
10/02/03 08:59
Read: 442 times
Philadelphia
USA


 		 #55934 - RE: Philips P89LPC932 IO Pin Current Rating
Responding to: Andy Neil's previous message
Andy,

I agree with you that the term "limiting values" is confusing, it should be Maximum values. Also in that same table it says under V0h that you can get 20 mA which I believe to be false. This would imply that you could source 20mA per pin, with no voltage drop, this is false.(See Kai's response on calculated transistor ON resistance)
The general rule of thumb for I/O pins is :

Sourcing = 5mA per pin

Sinking = 20mA per pin
This is based on the transistor circuitry that is used for the I/O pins, which is pretty much standardized.
The number of pins that can be used simultaneously is dependent on the Maximum Current allowed for that chip.

Regards,

Jacob





List of 19 messages in thread
TopicAuthorDate
Philips P89LPC932 IO Pin Current Rating      Andy Neil      09/30/03 17:39      
   RE: Philips P89LPC932 IO Pin Current Rating      Erik Malund      09/30/03 17:47      
      Limiting Value - or Test Condition?!      Andy Neil      09/30/03 17:55      
   RE: Philips P89LPC932 IO Pin Current Rating      Kai Klaas      10/01/03 00:28      
   RE: Philips P89LPC932 IO Pin Current Rating      Jacob Boyce      10/01/03 09:22      
      RE: Sinking only?      Andy Neil      10/01/03 11:16      
   Cross-posted on Philips forum      Andy Neil      10/01/03 15:16      
   RE: Philips P89LPC932 IO Pin Current Rating      Erik Malund      10/02/03 08:47      
      RE: Philips Data sheet woes      Andy Neil      10/02/03 15:13      
   RE: Philips P89LPC932 IO Pin Current Rating      Jacob Boyce      10/02/03 08:59      
      RE: Philips P89LPC932 IO Pin Current Rating      Erik Malund      10/02/03 09:23      
      RE: Philips P89LPC932 IO Pin Current Rating      Andy Neil      10/02/03 15:00      
         Already contacted factory?      Kai Klaas      10/02/03 15:07      
            RE: Already contacted factory?      Andy Neil      10/02/03 15:19      
               update - recommend a distributor?      Andy Neil      10/02/03 15:49      
                  RE: update - recommend a distributor?      Erik Malund      10/02/03 17:19      
                     RE: update - recommend a distributor?      Andy Neil      10/02/03 18:36      
   RE: Philips P89LPC932 IO Pin Current Rating      Jacob Boyce      10/02/03 10:19      
   Sink not source!      Kai Klaas      10/02/03 12:37      

Back to Subject List