M41T93ZMY6E

Real Time Clock Overview

The M41T93ZMY6E is a low-power serial SPI bus real-time clock (RTC) manufactured by STMicroelectronics. It features an embedded 32.768 kHz crystal within the SOX18 package, eliminating the need for external components. The device includes a built-in power sense circuit that automatically switches to a backup battery supply during main power failures. Key specifications include a supply voltage range of 2.0 V to 5.5 V and ultra-low battery current consumption of 365 nA. The register map comprises eight bytes for clock/calendar functions in BCD format, 17 bytes for status and control, and seven bytes of user SRAM.

Real Time Clock Feature Summary

• Embedded 32.768 kHz crystal oscillator integrated into the SOX18 package
• Automatic power failure detection with seamless switching to battery backup
• Factory calibrated accuracy of ±5 ppm typical after two reflow cycles
• SPI-compatible interface with automatic address incrementation

Real Time Clock Applications

• Portable electronic devices requiring precise timekeeping
• Industrial systems needing non-volatile calendar and alarm functions
• Data logging equipment utilizing the internal SRAM for temporary storage

Real Time Clock Procurement Notes

Verify the specific suffix 'E' against the manufacturer's latest documentation to confirm RoHS compliance status and lead times. Confirm package availability as distribution channels may vary between tubes and reels. Ensure the design supports the SOX18 footprint which integrates the crystal, differing from QFN variants.

Real Time Clock Selection Notes

Select this model when space constraints prohibit external crystals, leveraging the embedded oscillator in the SOX18 package. Choose over I2C-based RTCs if the system architecture utilizes SPI buses. Verify that the required operating temperature range aligns with the specified limits and that the 365 nA standby current meets the battery life requirements.

Real Time Clock Part Context

This component belongs to the M41T93 series of real-time clocks. The ZMY6E designation indicates the specific pinout, package type (SOX18), and commercial/industrial grade variations. It serves as a direct replacement for previous generations of RTCs requiring external crystals, simplifying PCB layout and reducing component count.

Real Time Clock Replacement Considerations

Direct pin-to-pin replacements within the same family include the M41T93ZMY6F. When substituting, verify that the alternative suffix does not alter the package dimensions or electrical characteristics. Cross-reference with the M41T83 series only if I2C interface compatibility is acceptable, noting the significant interface difference.