最近尝试做可靠性预计,碰到微芯的可靠性报告,求解释.附件如下.
关于报告内测试的解释如下:
DynamicLifeTest
TheDynamiclifetest(DLT)alsoknownastheHighTemperatureOperatingLife(HTOL)isperformedtodeterminethereliabilityofdevicessubjectedtospecificconditionsoveranextendedperiodsoftime.Devicesareexercisedatthemaximumdatasheetoperatingvoltage.Inaddition,anelevatedtemperatureandfunctionalsignalsareusedtoexercisethedeviceinamannersimilartousersystems.Devicesaresubjectedto150Cfor96hours(infant)and408hours(Longterm).Theactualfailurerateexperiencedcouldbeconsiderablylessthanthatcalculatediflowerdevicetemperaturesoccurintheapplicationboard.
DynamicLifeProcessBreakout
TheDynamiclifetest(DLT)alsoknownastheHighTemperatureOperatingLife(HTOL)isperformedtodeterminethereliabilityofdevicessubjectedtospecificconditionsoveranextendedperiodsoftime.Devicesareexercisedatthemaximumdatasheetoperatingvoltage.Inaddition,anelevatedtemperatureandfunctionalsignalsareusedtoexercisethedeviceinamannersimilartousersystems.Devicesaresubjectedto150Cfor96hours(infant)and408hours(Longterm).Theactualfailurerateexperiencedcouldbeconsiderablylessthanthatcalculatediflowerdevicetemperaturesoccurintheapplicationboard.
RetentionBake
Datastorageinapplicabledevicesisdonebydevelopingachargeonthefloatinggatestructureinthememorycell.Chargelossinthiscellstructureresultsinaconversionofzeroestoones.A150°CtemperatureisusedtoacceleratechargelossinthememorycellandmeasurethedataretentionontheEPROMandEEPROMportionsofthecircuitry.Devicessubjectedto175°Caretestedat96hoursand504hours.Thisbakeaccelerateschargelossinthememorycell,and96hoursat175°Cisequivalenttogreaterthan250yearsinthefieldat55°C.Theactualfailurerateexperiencedcouldbeconsiderablylessthanthatcalculatediflowerdevicetemperaturesoccurintheapplicationboard.
疑问是报告内的数据如何算出来的,例如用minitab.
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[quote][url=pid=171234&ptid=18030]sunjj发表于2016-5-410:42[/url]
[/quote]
SUNJJ老大，这个是个啥？
[img]D:\SJJ_use\Sjj_2[/img]
[img]D:\SJJ_use\Sjj_2\未命名1[/img]
[quote][url=pid=171116&ptid=18030]sunjj发表于2016-4-2720:14[/url]
1、这不是可靠性预计，是产品寿命试验。是以抽样试验来推断批次产品寿命；
2、数据计算是基于阿列纽斯公式…[/quote]
求解计算过程，SUNJJ:lol
这个是供应商给的MTTF报告,我苦逼在于如何根据408PCS运行96h，和303PCS运行408来计算出在60%置信度下是26FIT。
学习了
1、这不是可靠性预计，是产品寿命试验。是以抽样试验来推断批次产品寿命；
2、数据计算是基于阿列纽斯公式，以置信度60%，计算出MTTF。