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SN74ACT574: 无CLK来临前,上电的初始状态输出为高电平么

Part Number: SN74ACT574

SN74ACT574的使能信号直接下拉至地,无CLK上升沿时,为什么上电之后的初始状态输出为高电平?

测了很多次,一直是高电平,有可能会有低电平么?