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关于TXS0108E的问题

Other Parts Discussed in Thread: TXS0108E

你好,我这边电路采用TXS0108E,8位的电压双向转换器,VCCA为1.8V,VCCB为3.3V;电路应用是GPIO中断按键检测8个按键的,低电平触发方式;现在的情况是,未按下按键前,检测的电平是1.8V,电路正常,触发一次按键,结果电平就一直为低,这个情况是何种原因导致?