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SN74AUP1G17: 施密特电平的理解

Part Number: SN74AUP1G17

请问:施密特电平VT+和VT-中的最大值和最小值怎么理解?一个高电平要大于VT+的最小值就可被确认为高?还是要大于最大值才能确认为高?再一个,有的类型的VT-的最大值大于VT+的最小值,怎么理解?