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TPS22960管脚的Vih问题

Other Parts Discussed in Thread: TPS22960

附图是TPS22960的数据手册截取的。

1、想确认一下Vih的最大门限,无论Vin的芯片输入电压多大,都是5.5V吗?

2、一般的芯片,Vih的最大门限,都是Vin或者Vin+0.3V左右,为什么这个芯片的Vih可以做到和输入电压无关,都是5.5V呢?

谢谢!