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BUY PCF8563TS/5,118 https://www.utsource.net/itm/p/7250909.html
Real Time Clock Serial Clock/Calendar/Alarm/Timer/Interrupt 8-Pin TSSOP T/R
Description: The PCF8563TS/5,118 is a Real-Time Clock (RTC) and Calendar with an I2C-bus interface from NXP Semiconductors. Features: Low power consumption I2C-bus interface Clock/calendar with alarm Programmable clock/calendar Automatic power-fail detect and switch Battery switchover Interrupt output Operating voltage range: 2.0V to 5.5V Applications: Automotive Industrial Consumer Medical Wearables Smart home (For reference only)