电压检测 -> 带延时 the xz1909 series is a series of high-precision voltage detecto with a built-in delay time generator of fixed time. developed using cmos process. the detection voltage is fixed internally, with an accuracy of ±2.0 %. internal oscillator and counter timer can delay the release signal without external parts, delay times 200 ms two output forms, nch pen-drain and cmos output are available.