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Forum: Reliability & Maintainability Questions and Answers

Topic: Reliability & Maintainability Questions and Answers

Topic Posted by: Reliability & Maintainability Forum (src_forum@alionscience.com )
Organization: System Reliability Center
Date Posted: Mon Aug 31 12:47:36 US/Eastern 1998

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Original Message:

Posted by: XiangPing,Wu (7815@notesmail.huawei.com.cn )
Organization:HUAWEI.TECH.CO.,LTD
Date posted: Sun Apr 16 22:49:34 US/Eastern 2000
Subject: WCCA
Message:
I have bought a book of Worst Case Circuit Analysis Application Guidelines from RAC. I wonder where the figure 13 on page 71 and figure 14 on page 72 are from? Are they provided by the device vendor?


Reply:

Subject: WCCA Data Sources
Reply Posted by: Jack Farrell (jfarrell@alionscience.com )
Organization: Reliability Analysis Center
Date Posted: Mon Apr 17 8:28:06 US/Eastern 2000
Message:
Figure 13 Temperature Effects on Propagation Delay - Most vendors supply propagation delay information based on a temperature range from -55C to +125C. If the rated qualifying temperature specified is beyond the boundaries of your analysis Section 4.3.4.1 (pg 32) of your WCCA book provides an adjustment formula. Figure 14 Power Supply Effects on Propagation Delay - Most vendors publish the operating supply voltage range required for operation. However, very few vendors’ detail the effects of varying supply voltage on propagation delay. Section 4.3.4.2 (pg 32) of your WCCA book provides some guidelines for adjusting propagation delay vs. supply voltage.


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