M41T56MH6

M41T56MH6 – Serial I2C Real-Time Clock (RTC) – STMicroelectronics

Ensure precise timekeeping in your embedded systems with the M41T56MH6 serial I2C real-time clock (RTC) from STMicroelectronics. This low-power IC provides accurate calendar and clock functions with battery backup support, ideal for applications requiring reliable time-stamping or scheduling. PCX offers this essential timing component with guaranteed quality and rapid shipping.

Key Features

• I2C Serial Interface for easy microcontroller integration
• Ultra-Low Power Consumption extends battery life
• 56-Byte NVRAM for critical data retention
• Battery Switchover Circuitry maintains operation during power loss
• Programmable Square Wave Output for system synchronization
• Industrial Temperature Range (-40°C to +85°C)

Technical Details

The M41T56MH6 features a built-in 32.768 kHz oscillator and tracks time in seconds, minutes, hours, day, date, month, and year (including leap year correction). Its I2C-bus interface operates at 400 kHz, while the integrated power-fail detect circuit automatically switches to backup battery supply during main power loss. The device includes 56 bytes of general-purpose non-volatile SRAM, ensuring data persistence during outages.

Typical Applications

• Industrial automation controllers
• Smart meters & utility monitoring systems
• Medical diagnostic equipment
• POS terminals & kiosks
• Data loggers & telematics devices

About STMicroelectronics

STMicroelectronics is a global semiconductor leader with over 30 years of innovation in analog, power, and embedded processing solutions. Their components are renowned for industrial-grade robustness and reliability, serving mission-critical applications worldwide.

STMicroelectronics maintains rigorous quality certifications including ISO/TS 16949 and AEC-Q100 for automotive applications, ensuring consistent performance under demanding conditions. Their RTC portfolio sets industry standards for accuracy and power efficiency.

About Real-Time Clocks (RTC)

Real-Time Clocks are dedicated timing ICs that maintain accurate time and calendar functions independently of a system’s main processor. Unlike software-based solutions, hardware RTCs continue operating during power cycles using backup batteries, preventing data loss and maintaining critical timestamps.

RTCs are fundamental in systems requiring event logging, scheduled operations, or time-sensitive processes. Their low power consumption makes them indispensable in battery-powered devices, while tamper-proof features support security applications like financial terminals and access control systems.

Packaging Options

Available in Tape & Reel (TR) packaging for automated assembly. Contact PCX for specific reel quantities and cut tape options.

Frequently Asked Questions

Q: Does this RTC require an external crystal?
A: No, the M41T56MH6 includes an integrated 32.768 kHz oscillator – no external crystal needed.

Q: What battery voltage does it support for backup?
A: It accepts standard 3V lithium coin cells (e.g., CR2032) with automatic switchover down to 1.8V.

Q: How accurate is the timekeeping?
A: Typical accuracy is ±2ppm at 25°C (±1 minute per year) with automatic leap year compensation.

Q: Can it operate without a battery?
A: Yes, it functions with main power only. The battery is solely for backup during power failures.

Q: Is this compatible with 3.3V and 5V systems?
A: Yes, it supports 2.7V to 5.5V main supply voltage for broad compatibility.

Q: What’s the difference between RTC and microcontroller timers?
A: Dedicated RTCs like the M41T56MH6 consume microamps of power and maintain time during sleep modes, whereas MCU timers require constant power and lack calendar functions.

⚠️ Note: Product images are representational. Refer to datasheet for exact dimensions.

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