View r3117xxx1-2-series datasheet:

R3117xxx1/2 SERIES LOW VOLTAGE DETECTOR with SENSE pin NO.EA-186-111104 Notice If the SENSE pin voltage of R3117xxx1A/C and R3117Qxx2A/C make the gradual curve by rasing 0.5V/ms or less, it may cause noise when the output voltage is switched from low to high.Please use R3117xxx3A/C and R3117Qxx4A/C Series for new designs instead of these products to avoid the above problem. OUTLINE The R3117x series are CMOS-based voltage detector ICs with high detector threshold accuracy and ultra-low supply current, which can be operated at an extremely low voltage and is used for system reset as an example. Each of these ICs consists of a voltage reference unit, a comparator, resistors for detector threshold setting, an output driver and a hysteresis circuit. The detector thresh