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c6678掉电顺序控制问题



我看datasheet,c6678对掉电顺序还有一定要求,我不明白的的是一旦掉电(尤其是总电源掉电),整个电路板都不工作了,怎么还能控制掉电顺序呢?
我看一些电源上电顺序控制芯片,基本上都是对电源的使能端控制来实现的。我好奇的是一旦断电连这个芯片都不能工作了,怎么还能实现掉电顺序控制?