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PCF8563 http://www.semiconductors.philips.com/pip/PCF8563T/F4
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Wide operating supply voltage range: 1.0 to 5.5 V
Low back-up current; typical 0.25 µA at VDD = 3.0 V and Tamb =25°C
400 kHz two-wire I²C-bus interface (at VDD = 1.8 to 5.5 V)
Voltage-low detector
Integrated oscillator capacitor
Internal power-on reset
Open drain interrupt pin.
Неплохая табличка у ИТИСа http://www.itis.spb.ru/win/rtc/oth_rtc.htm
E-mail: info@telesys.ru