M41T56C64

www.DataSheet4U.com M41T56C64 Serial Real Time Clock with 56 bytes of NVRAM + 64 Kbit (8192 bit x 8) EEPROM Feature summary ■ ■ ■ ■ 5V ±10% supply voltage I2C bus compatible Operating temperature of –40 to 85°C Packaging includes: – 18-lead SOIC (with embedded crystal) 18 Embedded crystal ■ RoHS compliant 1 Serial RTC features ■ Counters for seconds, minutes, hours, day, date, month, years, and century Embedded crystal package Software clock calibration Automatic power-fail detect and switch circuitry 56 bytes of general purpose SRAM Ultra-low battery supply current of 450nA Automatic leap year compensation Special software programmable output Two-wire I2C serial interface supports 100kHz protocol SOX18(MY) 18-pin (300mil) SOIC ■ ■ ■ ■ ■ ■ ■ ■ Serial EEPROM features ■ 8192 bytes of general purpose EEPROM (more than 1e6 erase/write cycles) Two-wire I2C serial interface supports 400kHz protocol Byte and page write (up to 32 bytes) More than 40 year data retention Self-timed programming cycle ■ ■ ■ ■ September 2006 Rev 4 1/19 www.st.com 1 Contents www.DataSheet4U.com M41T56C64 Contents 1 Summary description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 1.1 Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 2 Pin settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 2.1 2.2 Pin description . . . . . . . . . . ....