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CDCM61004异常

Other Parts Discussed in Thread: CDCM61004

我们设备使用CDCM61004给交换芯片提供时钟,当最近从贴片厂回来一批单板,测试发现VCC_OUT对GND的阻值只有3~10欧,正常的大于120欧。异常板上电后再断电测量阻值变为了40~70欧左右。上电测输出波形有的正常,有的幅值偏低,有的无波形输出。断电后测量输出端的150欧电阻两端,正常的在150欧左右,异常的120欧或者40欧左右。我们将芯片替换,周边器件没动,测试指标都正常了。

本次一共投板84pcs,类似故障板有25pcs。请各位大神帮忙分析,芯片异常的原因。