RX-8801JE:UA3 ROHS

Real Time Clock Overview

The RX-8801JE:UA3 is an I2C-Bus interface real-time clock module manufactured by Epson Toyocom. It integrates a frequency-adjusted 32.768 kHz crystal unit and a DTCXO within a VSOJ-20 pin package. The device supports an interface voltage range of 1.6 V to 5.5 V, with a temperature-compensated voltage range of 2.2 V to 5.5 V. Stability is rated at ±3.4 × 10⁻⁶ over -40°C to +85°C (UA grade) or ±5.0 × 10⁻⁶ (UB grade). Key features include a full calendar, alarm, timer functions, and a 32.768 kHz CMOS output on the FOUT pin.

Real Time Clock Feature Summary

• Integrated 32.768 kHz-DTCXO for high stability without external frequency adjustment
• I2C-Bus interface supporting up to 400 kHz communication speed
• Built-in full calendar, alarm, and timer functions
• 32.768 kHz frequency output via dedicated FOUT pin

Real Time Clock Applications

• Industrial control systems requiring precise timekeeping
• Data logging equipment
• Communication devices needing synchronized timing

Real Time Clock Procurement Notes

Verify the specific stability grade (UA or UB) required for the application environment. Confirm that the operating voltage falls within the specified ranges for both standard operation and temperature compensation. Ensure the PCB layout accommodates the VSOJ-20 package dimensions and allows for proper I2C bus termination.

Real Time Clock Selection Notes

Select this model when a compact RTC solution with integrated crystal and DTCXO is needed. The UA grade offers ±3.4 ppm stability, while the UB grade provides ±5.0 ppm. Verify compatibility with the system's I2C voltage levels, as the interface supports 1.6 V to 5.5 V.

Real Time Clock Part Context

This component belongs to the RX-8801 series, which includes the SA variant in a 14-pin SOP package. Both variants share identical electrical specifications and functionality but differ in physical footprint and pin configuration to suit different board space constraints.

Real Time Clock Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided documentation. Direct replacement requires matching the I2C interface, voltage range, and stability requirements.