RX8900CEUA6

Real Time Clock Overview

The RX8900CEUA6 is a real-time clock module manufactured by Epson Timing, belonging to the RX8900CE series. It integrates a 32.768 kHz crystal unit and Digital Temperature Compensated Crystal Oscillator (DTCXO) technology to achieve high frequency accuracy of ±3.4 ppm across an operating temperature range of -40°C to +85°C. The device features an I2C bus interface with a maximum speed of 400 kHz and operates within a voltage range of 2.5 V to 5.5 V. It includes a power failure detection function that automatically switches from the main supply (VDD) to a backup battery or super-capacitor (VBAT). The module is supplied in a tape-and-reel packaging format.

Real Time Clock Feature Summary

• High precision: ±3.4 ppm accuracy over -40°C to +85°C using DTCXO technology
• Integrated 32.768 kHz crystal unit eliminating external components
• I2C bus interface supporting up to 400 kHz communication speed
• Automatic power source switching between VDD and VBAT upon power failure

Real Time Clock Applications

• Consumer electronics requiring precise timekeeping without external crystals
• Industrial equipment operating in wide temperature environments (-40°C to +85°C)
• Portable devices utilizing low-power backup battery or super-capacitor systems

Real Time Clock Procurement Notes

Verify the specific suffix 'UA6' against official Epson documentation to confirm package type and reel specifications. Confirm availability status as distribution channels may report limited stock or discontinuation. Ensure compatibility with system voltage levels (2.5V-5.5V) and I2C bus protocols before procurement.

Real Time Clock Selection Notes

Select this model when ±3.4 ppm accuracy is required over the full industrial temperature range. Compare with the UB variant (±5.0 ppm) if cost reduction is prioritized over precision. Ensure the design supports the 2.5V-5.5V operating range and utilizes the integrated crystal feature to save PCB space compared to discrete RTC solutions.

Real Time Clock Part Context

The RX8900CEUA6 is part of the RX8900CE family, which represents Epson's compact real-time clock modules. This series distinguishes itself by embedding the oscillator directly into the package, reducing board size and assembly complexity. It serves as a direct replacement for older discrete RTC designs requiring high stability in consumer and industrial applications.

Real Time Clock Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided data. Verify pinout and register compatibility if considering alternative RTCs from other manufacturers. Check if the UB or UC variants meet application requirements if UA6 is unavailable.