STMICROELECTRONICS M41T56 512 bit (64 bit x8) Serial Access TIMEKEEPER SRAM handbook
This document describes the features of the M41T56 512-bit (64-bit x8) Serial Access TIMEKEEPER® SRAM, which was released on June 24, 2004. The product has a supply voltage of 5V ±10%, counters for seconds, minutes, hours, day, date, month, years, and century, year 2000 compliance, software clock calibration, automatic power-fail detect and switch circuitry, compatibility with I2C bus, 56 bytes of general purpose RAM, ultra-low battery supply current of 450nA, low operating current of 300µA, operating temperature range of -40°C to 85°C, automatic leap year compensation, and a special software programmable output.
