SUMMARY DESCRIPTION
The M41T50 Serial Access TIMEKEEPER® is a low power Serial RTC that does not require a crystal. The clock operates from a digital clock input pin at 50Hz or 60Hz. Eight registers (see Table 2., page 12) are used for the clock/calendar function and are configured in binary coded decimal (BCD) format. An additional 8 registers provide status/control of Alarm, Square Wave (1Hz), and 50Hz or 60Hz digital clock frequency selection functions. Addresses and data are transferred serially via a two line, bi-directional I2C interface.

FEATURES SUMMARY
■ TIMEKEEPING DOWN TO 1.3V
■ 1.7V TO 3.6V I2C BUS OPERATING VOLTAGE
■ OPERATES FROM 50Hz OR 60Hz DIGITAL CLOCK SIGNAL
■ COUNTERS FOR SECONDS, MINUTES, HOURS, DAY, DATE, MONTH, YEAR, AND CENTURY
■ SERIAL INTERFACE SUPPORTS I2C BUS (400kHz)
■ PROGRAMMABLE ALARM AND INTERRUPT FUNCTION
■ 1Hz SQUARE WAVE OUTPUT
■ LOW OPERATING CURRENT OF 350µA
■ AUTOMATIC LEAP YEAR COMPENSATION
■ SOFTWARE PROGRAMMABLE OUTPUT (OUT)
■ OPERATING TEMPERATURE OF –40 TO 85°C
■ LEAD-FREE 16-PIN QFN PACKAGE