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关于SN74AHC245PWR IO反向为VCC供电

MingJie Weng
Prodigy 113 points
Other Parts Discussed in Thread: SN74AHC245, SN74LVC8T245

 您好，TI

当前项目中使用SN74AHC245PWR为信号缓冲，现在如果SN74AHC245PWR VCC供电关闭，但SN74AHC245PWR 输入IO仍旧保持3.3V高电平输入，竟然可以在VCC上仍旧检测到2.2V电压，表现出SN74AHC245PWR的IO口通过芯片为VCC供电了，请问这个现象是什么导致的？