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问 用S3C44B0采集一个极易变化的数据，因此想用74LS573进行数据锁存，但是74LS573是5V 高电平，ARM扳引脚是3.3V。除了光偶隔离之外，有没更好的办法呢？因为八个数据线,要光隔八个，太麻烦了,谢谢 答 1: 随便加个buffer吧 答 2: 74LV57374LV573; Octal D-type transparent latch (3-State)
The 74LV573 is a low-voltage Si-gate CMOS device that is pin and function compatible with 74HC/HCT573. The 74LV573 is an octal D-type transparent latch featuring separate D-type inputs for each latch and 3-State outputs for bus oriented ...

答 3: 74hc系列的可以工作在3V