M41T50Q6F

Real Time Clock Overview

The M41T50 is a serial access real-time clock (RTC) from STMicroelectronics that operates without an internal crystal. It requires an external digital clock input signal of 50Hz or 60Hz to function. The device supports I2C bus communication at frequencies up to 400kHz and operates within a supply voltage range of 1.7V to 3.6V, with timekeeping capability down to 1.3V. It features automatic leap year compensation and includes programmable alarm and interrupt functions. The unit is housed in a lead-free 16-pin QFN package.

Real Time Clock Feature Summary

• Crystal-less operation using external 50Hz or 60Hz digital clock input
• I2C interface supporting 400kHz bus speed
• Automatic leap year compensation for calendar accuracy
• Programmable alarm with multiple repeat modes and 1Hz square wave output

Real Time Clock Applications

• Embedded systems requiring low-power timekeeping
• Industrial equipment utilizing external clock sources
• Consumer electronics with I2C connectivity

Real Time Clock Procurement Notes

Verify the specific ordering suffix to confirm package type and shipping method. The 'Q' suffix indicates a 16-lead QFN package, while '6' denotes the industrial temperature range of -40°C to +85°C. Confirm availability as this is preliminary data subject to change.

Real Time Clock Selection Notes

Select this component only if the system provides a stable 50Hz or 60Hz digital clock signal on the CLKIN pin. Ensure the operating voltage remains between 1.7V and 3.6V for proper I2C functionality. Consider the open-drain requirements for the SQW and IRQ/OUT pins when designing pull-up circuits.

Real Time Clock Part Context

This part belongs to the M41T series of TIMEKEEPER RTCs. Unlike standard RTCs, it eliminates the need for a quartz crystal by accepting a direct digital clock input. It is designed for applications where space savings and simplified BOM are priorities, provided an external clock source is available.

Real Time Clock Replacement Considerations

Direct replacements must support external digital clock inputs rather than internal oscillators. Verify compatibility with existing I2C address maps and register structures. Check if alternative parts require different power management strategies for the 1.3V timekeeping mode.