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关于CALVC164245MDGGREP的问题请教。

Other Parts Discussed in Thread: SN74LVC16T245, SN74ALVC164245-EP

现在利用一个+15V和一个+3.3V供电,+15V经过一个117转+5V,让后将这个5V和3.3V分别作为164245的两个电源端实现5V到3.3V的电平转换。但是现在出现了我通电时间一长发现164245发出的声响,然后电流突变,一测发现5V和地短接了。请问这可能是什么原因导致的?