MAX31343EKA+T

Real Time Clock Overview

The MAX31343EKA+T is a low-cost, extremely accurate I2C real-time clock (RTC) featuring an integrated microelectromechanical systems (MEMS) resonator. This integration eliminates the need for external crystals and enhances long-term accuracy. The device maintains seconds, minutes, hours, day, date, month, year, and century information with automatic leap-year compensation up to 2199. It operates within a supply voltage range of +1.6V to +5.5V and provides timekeeping accuracy of ±5ppm (±0.432 second/day) from -40°C to +85°C. Key features include two programmable alarms, a digital temperature sensor, and automatic power-fail switching.

Real Time Clock Feature Summary

• Integrated MEMS Resonator: Eliminates external crystal requirements while providing high-accuracy timekeeping.
• High Timekeeping Accuracy: Maintains ±5ppm accuracy (±0.432 second/day) across the industrial temperature range (-40°C to +85°C).
• Automatic Power Management: Includes a voltage reference and comparator circuit that automatically switches to backup supply upon power failure.
• Programmable Outputs: Features two time-of-day alarms, a temperature-compensated square-wave output, and an uncompensated clock output.

Real Time Clock Applications

• Industrial equipment requiring precise timing
• Action cameras needing compact RTC solutions
• Communications infrastructure devices
• Handheld instrumentation
• Wearable electronics

Real Time Clock Procurement Notes

Verify the specific package configuration against the datasheet, as the MAX31343 is available in both 8-pin WLP and TDFN packages. Confirm that the ordering suffix corresponds to the desired tape-and-reel packaging format indicated by the 'T' in the model number. Ensure compatibility with the target system's I2C bus voltage levels, which can support pullups up to 5.5V regardless of VCC.

Real Time Clock Selection Notes

Select this component when design constraints require eliminating external crystals to save board space and improve reliability. The integrated MEMS resonator simplifies layout compared to traditional crystal-based RTCs. Consider the ±5ppm accuracy specification for applications sensitive to long-term drift without external temperature compensation circuits. Verify that the 64-byte user RAM meets data storage needs alongside the calendar functions.

Real Time Clock Part Context

The MAX31343 belongs to Analog Devices' family of serial real-time clocks designed for low-power and high-accuracy applications. Unlike legacy DS13xx series parts that often require external crystals, this device utilizes on-chip MEMS technology. It serves as a modern replacement for discrete RTC solutions in space-constrained designs where maintaining accurate time during main power interruptions is critical.

Real Time Clock Replacement Considerations

Public confirmed substitute part numbers are not provided in the source material.