M41T94MQ6F

Real Time Clock Overview

The M41T94MQ6F is a real-time clock (RTC) and battery-backed static RAM device manufactured by STMicroelectronics. It integrates a high-accuracy RTC with a calendar and alarm functions, alongside 256 bytes of battery-backed SRAM for data retention. The device communicates via the I2C bus interface, operating at standard mode speeds up to 400 kHz. It supports multiple voltage supplies, including VDD for the main logic and VBAT for backup power, ensuring continuous timekeeping during primary power loss. Key features include automatic calendar compensation for leap years and programmable square wave output.

Real Time Clock Feature Summary

• Integrated real-time clock with calendar (seconds, minutes, hours, day, date, month, year) and alarm capabilities
• 256-byte battery-backed static RAM for non-volatile data storage
• I2C serial interface supporting standard (100 kHz) and fast (400 kHz) modes
• Automatic leap year compensation valid until 2100

Real Time Clock Applications

• Consumer electronics requiring precise timekeeping and data retention
• Industrial control systems needing reliable backup memory
• Telecommunications equipment with synchronization requirements

Real Time Clock Procurement Notes

Verify the specific package type and tape/reel configuration against the official datasheet before ordering. Confirm that the voltage levels (VDD and VBAT) match the target system design. Ensure compatibility with the host microcontroller's I2C pull-up requirements and address settings. Check for any specific ordering suffixes that may indicate temperature range or packaging variations.

Real Time Clock Selection Notes

Select this component when both real-time clock functionality and small-scale non-volatile memory are required in a single package. Consider the I2C interface speed and address conflicts within the system bus. Evaluate the power consumption profiles for both active and standby modes relative to the application's battery life constraints. Verify that the operating temperature range meets the environmental specifications of the end product.

Real Time Clock Part Context

This part belongs to the M41T series of real-time clocks from STMicroelectronics. These devices are designed to provide low-power timekeeping solutions for embedded systems. The M41T94 variant specifically adds integrated SRAM, distinguishing it from basic RTC-only models in the family. It is commonly used in applications where space savings and reduced component count are critical design factors.

Real Time Clock Replacement Considerations

Direct replacements should be sought from the same M41T series or compatible RTC/SRAM combinations. Verify pin-to-pin compatibility if substituting in an existing PCB layout. Ensure that the replacement device supports the same I2C protocol and voltage levels. Cross-reference the package dimensions to confirm mechanical fit.