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SN74HC540PW，或者SN74LV8151PWR使用3.3V供电，输入能否接5V的TTL电平
您好，
SN74HC540 不可以，如下截图所示，最大输入到VCC：
SN74LV8151 可以，最大到5.5V，与供电电压无关：
