M41ST84WMQ6F

Real Time Clock Overview

The M41ST84WMQ6F is a low-power serial real-time clock (RTC) with supervisory functions, manufactured by STMicroelectronics. It features a 512-bit static CMOS SRAM organized as 64 words by 8 bits, with 8 bytes dedicated to the clock/calendar and 44 bytes for general-purpose user RAM. The device operates on a 2-wire I2C bus supporting up to 400 kHz. It includes automatic power-fail detection, battery switchover, programmable alarms, a watchdog timer, and a microprocessor power-on reset. The component is available in a 16-lead SOIC package.

Real Time Clock Feature Summary

• Serial interface supports I2C bus at 400 kHz
• Automatic switch-over and deselect circuitry for power failures
• Programmable alarm and interrupt function valid during battery backup
• Watchdog timer and microprocessor power-on reset

Real Time Clock Applications

• Industrial control systems requiring time-stamping
• Telecommunications equipment needing reliable RTC
• Consumer electronics with battery backup requirements

Real Time Clock Procurement Notes

Verify the specific suffix '6F' against the manufacturer's current datasheet to confirm packaging details and compliance status, as ordering suffixes can indicate variations in tape-and-reel specifications or environmental certifications. Ensure the voltage variant matches the application needs, as the base model covers both 3.0V and 5.0V operating ranges.

Real Time Clock Selection Notes

Select the M41ST84W variant for applications requiring a 2.7V to 3.6V supply range with a power-fail deselect voltage between 2.55V and 2.70V. Choose the M41ST84Y variant for 4.5V to 5.5V supplies with a power-fail deselect voltage between 4.20V and 4.50V. Confirm that the external crystal load capacitance matches the internal oscillator requirements for accurate timing.

Real Time Clock Part Context

This component belongs to the M41ST84 series of serial RTCs from STMicroelectronics. The series is designed for applications requiring non-volatile memory and precise timekeeping with minimal MCU interconnect. The 'M41ST84WMQ' designation indicates the 16-lead SOIC package version, while the '6F' suffix typically denotes specific packaging or compliance attributes defined by the manufacturer.

Real Time Clock Replacement Considerations

Publicly confirmed substitute part numbers are not provided in the source material. When selecting a replacement, ensure compatibility with the I2C protocol, voltage levels, and pinout configuration of the original component.