The HT1381A is a Real-time Clocks Clock/Calendar Serial 1uA @ 2V ~ 5V SOP-8_150mil from Holtek, a premier semiconductor manufacturer. This RoHS compliant device is specifically designed to provide a continuously-running clock/calendar with accurate timekeeping and long-term stability. It is housed in a low-power SOP-8_150mil package and can operate on voltages as low as 2V up to 5V. The HT1381A provides two sets of programmable timers for applications requiring periodic alarms, automatic power-on reset, and supervisor functions. Additionally, this part features an internal temperature-compensated voltage reference, on-board oscillator, and 64 bytes of SRAM to store day, time, and date.