M41T56_07 Datasheet, PDF (1/25 Pages) STMicroelectronics – Serial real-time clock with 56 bytes NVRAM

M41T56
Serial real-time clock with 56 bytes NVRAM
Features
■ Counters for seconds, minutes, hours, day,
date, month, years, and century
■ 32KHz crystal oscillator integrating load
capacitance (12.5pF) providing exceptional
oscillator stability and high crystal series
resistance operation
■ Serial interface supports I²C bus (100kHz
protocol)
■ Ultra-low battery supply current of 450nA
(typ at 3V)
■ 5V ±10% supply voltage
■ Timekeeping down to 2.5V
■ Automatic power-fail detect and switch circuitry
■ 56 bytes of general purpose RAM
■ Software clock calibration to compensate
crystal deviation due to temperature
■ Automatic leap year compensation
■ Operating temperature of –40°C to 85°C
■ Available in an 8-lead, 150mil, plastic SOIC
(SO8)
■ RoHS compliant
– Lead-free second level interconnect
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SO8 (M) 150mil width
December 2007
Rev 8
1/25
www.st.com
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