Datasheet

PCF8563
Real time clock/calendar
Rev. 04 — 12 March 2004 Product data
1. General 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 kbit/s. The built-in word address
register is incremented automatically after each written or read data byte.
2. Features
■ Provides year, month, day, weekday, hours, minutes and seconds based on
32.768 kHz quartz crystal
■ Century flag
■ Clock operating voltage: 1.8 V to 5.5 V
■ Low backup current; typical 0.25 µA at V
DD
= 3.0 V and T
amb
=25°C
■ 400 kHz two-wire I
2
C-bus interface (at V
DD
= 1.8 V to 5.5 V)
■ Programmable clock output for peripheral devices (32.768 kHz, 1024 Hz,
32 Hz and 1 Hz)
■ Alarm and timer functions
■ Integrated oscillator capacitor
■ Internal power-on reset
■ I
2
C-bus slave address: read A3H and write A2H
■ Open-drain interrupt pin.
3. Applications
■ Mobile telephones
■ Portable instruments
■ Fax machines
■ Battery powered products.