DESCRIPTION
The PCF8563 is a CMOS real-time clock/calendar optimized for low power consumption. A programmable clock output, interrupt output and voltage-low detector are also provided. All address and data are transferred serially via a two-line bidirectional I 2 C-bus. Maximum bus speed is 400 kbits/s. The built-in word address register is incremented automatically after each written or read data byte.

FEATURES
● Provides year, month, day, weekday, hours, minutes and seconds based on32.768 kHz quartz crystal
● Century flag
● Wide operating supply voltage range: 1.0 to 5.0 V
● Low back-up current; typical 0.25 µA at V D D = 3.0 V and Tamb = 25 °C
● 400 kHz two-wire I 2 C-bus interface (at V D D = 1.8 to 5.0 V)
● Programmable clock output for peripheral devices: 32.768 kHz, 1024 Hz, 32 Hz and 1 Hz
● Alarm and timer functions
● Voltage-low detector
● Integrated oscillator capacitor
● Internal power-on reset
● I 2 C-bus slave address: read A3H; write A2H
● Open drain interrupt pin.