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LSF工作方式类似无源开关，当输入为低电平时LSF的通道 FET将一直导通，接收器处的输入通过FET也被驱动为低电平，注意这里会有一定的电流流过FET导通电阻，会产生一定的压降，形成输出端的VOL。当输入高电平时，FET开关断开，上拉电阻决定电压。参见[[FAQ] How do the LSF translators work? 和应用手册 Voltage-Level Translation With the LSF Family (SLVA675)。
