M41T80M6F

Real Time Clock Overview

The M41T80M6F is a low-power serial real-time clock (RTC) manufactured by STMicroelectronics, designed for industrial applications. It operates within a supply voltage range of 2.0 V to 5.5 V and supports an operating temperature range from -40°C to +85°C. The device features an I²C bus interface supporting speeds up to 400 kHz. It integrates a 32.768 kHz oscillator with built-in load capacitance (12.5 pF), eliminating the need for external capacitors. The RTC maintains time in binary coded decimal (BCD) format across eight registers covering seconds through century. Key electrical parameters include a maximum current consumption of 2.4 µA at 2 V and 31 µA at 5.5 V.

Real Time Clock Feature Summary

• Integrated 32.768 kHz oscillator with internal 12.5 pF load capacitance for high stability
• I²C serial interface compatible with standard and fast mode (up to 400 kHz)
• Programmable alarm function and interrupt output capability
• Square wave output generator with programmable frequencies from 1 Hz to 32 KHz

Real Time Clock Applications

• Smart grid distribution systems and smart meters
• Industrial control systems requiring precise timekeeping
• Embedded devices needing battery-backed time retention

Real Time Clock Procurement Notes

Verify the specific ordering suffix against the manufacturer's official datasheet to ensure correct package type and tape/reel specifications. Confirm RoHS compliance status, as ECOPACK versions may have distinct environmental certifications. Check for moisture sensitivity level (MSL) ratings if the component has been exposed to ambient conditions prior to assembly. Ensure the supplier provides valid traceability documentation for industrial-grade components.

Real Time Clock Selection Notes

Select this component when a dedicated RTC with integrated oscillator is required to reduce bill of materials count. The M41T80M6F is suitable for designs where board space is limited due to the elimination of external tuning capacitors. Verify that the host microcontroller supports the I²C protocol and can handle the BCD data format used by the RTC registers. Consider the power budget, as current consumption varies significantly between 2 V and 5.5 V supply rails.

Real Time Clock Part Context

The M41T80M6F belongs to the M41T80 family of serial real-time clocks from STMicroelectronics. This series is distinguished by its integration of the crystal oscillator circuitry, which simplifies PCB layout compared to earlier RTC generations. The 'M6F' suffix typically denotes the SOIC-8 surface-mount package variant compliant with specific manufacturing standards defined by the manufacturer.

Real Time Clock Replacement Considerations

Direct pin-to-pin replacements within the same package should be verified against the official cross-reference list. Components such as the M41T81 series offer similar interfaces but may differ in memory capacity or additional features like backup switching. Always validate register compatibility before substituting, as command sets may vary between different RTC families.