M41T81MX6

Real Time Clock Overview

The M41T81MX6 is a low-power serial real-time clock (RTC) manufactured by STMicroelectronics. It features an integrated 32.768 kHz oscillator and operates within a voltage range of 2.0 V to 5.5 V. The device utilizes an I2C bus interface for data transfer, supporting the 400 kHz protocol. Clock and calendar functions are stored in eight bytes of SRAM configured in binary-coded decimal (BCD) format, covering century, year, month, date, day, hour, minute, and second. An additional 12 bytes manage alarm, watchdog, and square wave status. Automatic leap year correction is valid until 2100.

Real Time Clock Feature Summary

• Integrated 32.768 kHz crystal oscillator with built-in load capacitance
• Automatic power failure detection and battery switchover circuitry
• I2C serial interface supporting up to 400 kHz communication speed
• Non-volatile time-of-day clock/calendar with automatic leap year adjustment

Real Time Clock Applications

• Portable consumer electronics requiring precise timekeeping
• Industrial control systems needing reliable clock synchronization
• Data logging equipment with battery backup requirements

Real Time Clock Procurement Notes

Verify package type and suffix specifications against official datasheets before ordering. Confirm availability through authorized distributors as supply levels fluctuate. Ensure compatibility with system voltage ranges and I2C bus protocols during procurement planning.

Real Time Clock Selection Notes

Select this component when a low-power RTC with integrated oscillator is required. Verify that the SOIC-8 package fits the PCB layout constraints. Check if the specific memory size and alarm features meet application needs compared to variants like M41T81S or M41T83.

Real Time Clock Part Context

This part belongs to the M41T81 series of real-time clocks from STMicroelectronics. It shares core functionality with other members like M41T81S but differs in packaging and specific integration details. The series is designed for applications requiring accurate timekeeping with minimal power consumption.

Real Time Clock Replacement Considerations

Direct replacements include M41T81S for similar functionality in different packages. Evaluate M41T83 for enhanced accuracy and additional user SRAM. Verify pinout compatibility and software register mapping before substituting.