Intel mPGA604 manual Environmental Requirements, Use Conditions Environment

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5Environmental Requirements

Design, including materials, shall be consistent with the manufacture of units that meet the following environmental reference points.

The reliability targets in this section are based on the expected field use environment for a desktop product. The test sequence for new sockets will be developed using the knowledge-based reliability evaluation methodology, which is acceleration factor dependent. A simplified process flow of this methodology can be seen in Figure 5-1.

Figure 5-1. Flowchart of Knowledge-Based Reliability Evaluation Methodology

Establish the Market/ Expected Use Environment for the Technology

Freeze Stressing

Requirements and

Perform Additional Data

Turns

Develop Speculative Stress Conditions Based on Historical Data, Content Experts, and Literature Search

Perform Stressing to Validate Accelerated Stressing Assumptions and Determine Acceleration Factors

A detailed description of this methodology can be found at:

http://developer.intel.com/design/packtech/245162.htm

The use environment expectations assumed are for desktop processors, based on an expected life of 7 to 10 years, are listed in Table 5-1.The target failure rates are <1% at 7 years and <3% at 10 years.

Table 5-1. Use Conditions Environment

Use Environment	Speculative Stress	7 Year Life	10 Year Life
	Condition	Expectation	Expectation
Slow small internal gradient changes due	Temperature Cycle	1500 cycles with a	2150 cycles with
to external ambient (temperature cycle or		mean ∆ T = 40OC	a mean ∆ T =
externally heated).			40OC
High ambient moisture during low-power	THB / HAST	62,000 hrs at	89,000 hrs at
state (operating voltage).		30° C, 85% RH	30° C, 85%RH
High Operating temperature and short	BAKE	62,000 hrs at	89,000 hrs at
duration high temperature exposures.		Tjmax	Tjmax

mPGA604 Socket Design Guidelines 29