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Mobile Pentium II Power Input

Posted on 2001-06-13
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Last Modified: 2010-04-27
I am working with a Pentium II Processor with On-die Cache Mobile Module Connector 2 (MMC-2).

According to the data sheet, the maximum DC Input current is 3.5 Amps. I would like to know if anyone has experienced glitch problems where the current goes higher than or near that 3.5 Amps. (not on start-up)

Thank you !
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Question by:Chommy
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4 Comments
 
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Expert Comment

by:jhance
ID: 6187463
Remember that the MAX DC current for a device like this is rated with the chip's input and output lines connected as specified in the "test conditions" part of the spec.  If you have other things out there, especially bus lines with significant capacitance on them, you can get MUCH larger currents when power is first applied or when output lines switch.  Especially critical are lines with a 0 -> 1 transition since the CPU must source current into these lines.  With as many outputs as PII CPUs have, this can be considerable.

Remember that Intel cannot anticipate what you might put out there on the bus lines and so they rate the CPU itself with a "standard" load.  Now that load may not represent the real world (and it usually does not) but it is a reference point.
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by:Chommy
ID: 6196341
O.K thanks. I have created a test application to try to overload the cpu and drain more current. But I never get near the 3.5 Amps in the specs.

Are there other ways I can get the current to ramp up or is there any documentation on the glithes that might occur other than the data sheet of the pentium chip ?

Thanks

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jhance earned 600 total points
ID: 6196489
>>I never get near the 3.5 Amps in the specs.

Your question is really confusing!  You ask about seeing input current HIGHER than the spec but now complain that it is NOT AS HIGH AS the spec!!  This is like compaining to Intel that your CPU runs at 2GHz when you paid for a 1GHz one.  

The current rating is a MAXIMUM VALUE.  Intel does not spec the MINIMUM current!!
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Author Comment

by:Chommy
ID: 6197143
hehe..

I know, I am just trying to solve a mysterious bug that I have and the only explanation would be that the current reaches the 3.5 Amps for a few microseconds...The only problem is that I have never witnessed that event.

Thanks for your help.
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