MCU的IO口是3.3V的,其输出PWM信号通过SN74LVC2G17去驱动风扇调速,SN74LVC2G17的供电电压是5V,按照施密特触发器VT+的阈值看上去也是可以的,实测SN74LVC2G17输出的5V pwm信号好像也是没有问题的,但是规格书上好像只说了能用在5V转3.3V上,不能用3.3V转5V,请问是为什么?
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MCU的IO口是3.3V的,其输出PWM信号通过SN74LVC2G17去驱动风扇调速,SN74LVC2G17的供电电压是5V,按照施密特触发器VT+的阈值看上去也是可以的,实测SN74LVC2G17输出的5V pwm信号好像也是没有问题的,但是规格书上好像只说了能用在5V转3.3V上,不能用3.3V转5V,请问是为什么?