RX8010SJ:B3 PURE SN

Real Time Clock Overview

The EPSON RX8010SJ:B3 PURE SN is a real-time clock (RTC) integrated circuit manufactured by Seiko Epson Corporation. It features an internal temperature-compensated crystal oscillator (TCXO), eliminating the need for external crystals and reducing PCB footprint. The device operates on a single supply voltage ranging from 1.6 V to 5.5 V and communicates via a standard I²C bus interface with a maximum frequency of 400 kHz. It provides accurate timekeeping for years, months, days, weekdays, hours, minutes, and seconds in BCD format. The component supports alarm functions, periodic interrupts, and a fixed-cycle timer. Designed for industrial applications, it maintains functionality within an operating temperature range of -40°C to +85°C.

Real Time Clock Feature Summary

• Integrated Temperature-Compensated Crystal Oscillator (TCXO) for high accuracy without external components
• Wide operating voltage range: 1.6 V to 5.5 V
• I²C Bus Interface supporting Standard Mode (100 kHz) and Fast Mode (400 kHz)
• Alarm function with configurable minute, hour, and day/date parameters
• Fixed-Cycle Timer (FCT) and Time Update Interrupt capabilities

Real Time Clock Applications

• Smart home devices such as thermostats and controllers
• Industrial control systems and measurement instruments
• IoT sensor nodes requiring low power consumption
• Wearable electronics and smart meters

Real Time Clock Procurement Notes

Verify the specific suffix 'B3' against official Epson documentation to confirm exact packaging, tape-and-reel specifications, or regional compliance variations. Ensure that the ordering code matches the required lead times and production cycles provided by authorized distributors. Confirm RoHS and REACH compliance status through the manufacturer's environmental data sheets prior to procurement.

Real Time Clock Selection Notes

Select this component when high timing precision is required without the reliability risks associated with external crystals. The wide voltage range allows compatibility with various logic levels. Developers must account for BCD encoding in register writes and adhere to the 950 ms I²C communication timeout limit specified in the datasheet to prevent communication errors during initialization or data retrieval.

Real Time Clock Part Context

The RX8010SJ series belongs to Epson’s line of ultra-low power RTCs featuring built-in TCXOs. The 'SJ' designation typically indicates the SOP-8 package variant. The suffix ':B3 PURE SN' specifies the particular orderable version, likely denoting specific packaging or purity standards defined by Epson Timing. This model replaces traditional discrete RTC solutions by integrating the oscillation circuitry directly into the silicon.

Real Time Clock Replacement Considerations

Direct pin-to-pin replacements should be verified against Epson's official cross-reference lists. Alternative RTCs may require external crystals and different register configurations. Verify that substitute components support the same I²C address (0x32) and voltage ranges if maintaining existing board layouts.