The XC6121/XC6122/XC6123/XC6124 series are groups of high-precision, low current consumption voltage detectors with watchdog functions incorporating CMOS process technology. The series consist of a reference voltage source, delay circuit, comparator, and output driver. With the built-in delay circuit, the XC6121/XC6122/XC6123/XC6124 series' ICs do not require any external components to output signals with release delay time. The output type is VDFL low when detected. With the XC6121/XC6122/XC6123/XC6124 series' ICs, the EN/ENB pin can control ON and OFF of the watchdog functions. By setting the EN/ENB pin to low or high level, the watchdog function can be OFF while the voltage detector remains operation. Since the EN/ENB pin of the XC6122 and XC6124 series is internally pulled up to the VIN pin or pulled down to the VSS pin, the ICs can be used with the EN/ENB pin left open, when the watchdog functions is used. The detect voltages are internally fixed 1.6V ~ 5.0V in increments of 100mV, using laser trimming technology. Six watchdog timeout period settings are available in a range from 50ms to 1.6s. Five release delay time settings are available in a range from 3.13ms to 400ms.