Intel Xeon 3.20GHz Processor RK80546KG0882MM User Manual

 

 

 

18 

4 

Maximum Average Contact 
Resistance. Refer to 

Item 4 

The max average resistance target is originally 
derived from max resistance of each chain 
minus resistance of shorting bars divided by 
number of pins in the daisy chain. This value 
has to be satisfied at all time. Thus, this is the 
spec valid at End of Line, End of Life and etc. 
Socket Contact Resistance

: The resistance 

of the socket contact, interface resistance to 
the pin, and the entire pin to the point where 
the pin enters the interposer; gaps included.  

5 

Measurement frequency(s) for 
capacitance.  

Capacitively dominate region. This is usually 
the lowest measurable frequency. This should 
be determined from the measurements done 
for the feasibility.  

6 

Measurement frequency(s) for 
inductance.  

Linear region. This is usually found at higher 
frequency ranges. This should be determined 
from the measurements done for the feasibility.  

and 

 show the proposed methodology for measuring the final electrical 

resistance. The methodology requires measuring interposer flush-mounted directly to the 
motherboard fixtures, so that the pin shoulder is flush with the motherboard, to get the averaged 
jumper resistance, Rjumper. The Rjumper should come from a good statistical average of 30 
package fixtures flush mounted to a motherboard fixture. The same measurements are then made 
with a package fixture mounted on a supplier’s socket, and both are mounted on a motherboard 
fixture; this provides the R

Total

. The resistance requirement, R

Req

, can be calculated for each chain as 

will be explained later. 

 4-1. Methodology for Measuring Total Electrical Resistance. 

 

 4-2. Methodology for Measuring Electrical Resistance of the Jumper