TIOL1123作为输出，使用NPN模式，TX固定为高电平，当EN为高电平时，CQ输出正常，为0V。当EN端为低电平时，CQ此时应该为高阻状态，但实际情况是CQ电压先稳定在4V左右，持续40ms后才会变成0V。这是什么情况？
紫色为EN 黄色为CQ
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