NXP PCF8563TS/5,118, Real Time Clock (RTC), 128 bit, 128 bit RAM, 8, 8-Pin TSSOP8, TSSOP8

The NXP PCF8563 is a CMOS1 real time clock and calendar optimized for low power consumption. A programmable clock output, interrupt output, and voltage low detector are also provided. All addresses and data are transferred serially via a two line bidirectional I2C bus. Maximum bus speed is 400 kbit/s.

Open-drain interrupt pin
Alarm and timer functions
Integrated oscillator capacitor