The 557GI-05ALF is a Real-time Clocks TSSOP-20 RoHS device by Integrated Device Tech. It is a high-performance, low-power real-time clock (RTC) that is designed to provide an extremely reliable timekeeping solution with minimal power consumption. This chip features a programmable clock oscillator, clock buffer, low-voltage monitoring functions and a high-accuracy programmable time counter. It offers a 6x4 (24-bit) battery-backed SRAM to store program configuration and real-time data. Additionally, it includes a CPU supervisor module to monitor system power and reset activities. Overall, this part is an ideal choice for mobile, telecommunications, embedded systems and security applications.