Intel 6700PXH 64-BIT PCI HUB - MECHANICAL DESIGN, Руководство по конструкции

Страница: 22 / 28

Reference Thermal SolutionReference Thermal SolutionReference Thermal Solution
R
22 Intel
®
6700PXH 64-bit PCI Hub Thermal/Mechanical Design Guidelines
Figure 6-7. Torsional Clip Heatsink Extrusion Profile
6.5.6 Clip Retention Anchors
For Intel
®
6700PXH 64-bit PCI Hub-based platforms that have very limited board space, a clip
retention anchor has been developed to minimize the impact of clip retention on the board. It is
based on a standard three-pin jumper and is soldered to the board like any common through-hole
header. A new anchor design is available with 45° bent leads to increase the anchor attach reliability
over time. See Appendix A for the part number and supplier information.
6.6 Reliability Guidelines
Each motherboard, heatsink and attach combination may vary the mechanical loading of the
component. Based on the end user environment, the user should define the appropriate reliability
test criteria and carefully evaluate the completed assembly prior to use in high volume. Some
general recommendations are shown in Table 6-2Table 6-2Table 6-2.
Table 6-2. Reliability Guidelines
Test
(1)
Requirement Pass/Fail Criteria
(2)
Mechanical Shock 50 g, board level, 11 msec, 3 shocks/axis. Visual Check and Electrical
Functional Test
Random Vibration 7.3 g, board level, 45 min/axis, 50 Hz to 2000 Hz.
Visual Check and Electrical
Functional Test
Temperature Life 85°C, 2000 hours total, checkpoints at 168, 500,
1000, and 2000 hours. Visual Check
Thermal Cycling –5°C to +70°C, 500 cycles. Visual Check
Humidity 85% relative humidity, 55°C, 1000 hours. Visual Check
NOTES:
1. It is recommended that the above tests be performed on a sample size of at least twelve assemblies from
three lots of material.
2. Additional pass/fail criteria may be added at the discretion of the user.