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DS90UB9702-Q1: PDB信号为什么会有上升沿时间要求?

Part Number: DS90UB9702-Q1

TI team:

       请问, PDB信号是控制9702的power on/off,为什么会有上升沿时间要求?  如果不满足这个上升沿时间要求,会有什么异常?  

PS:9724和9702的PDB设计是一样的,下图是9724的截图。