我用SN74LVC4245ADW 这个芯片,一端是3.3V,一端是5 V,3.3是由5V通过DC/DC转换得到。3.3V侧的IO通道有下拉电阻,现在遇到这样一个问题,在上电时,5V侧会输出1个高电平出来,在3.3V电源稳定后,5V侧输出的高电平才消失,请问是怎么回事呢?
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