RX-8025SA:AA0:PURE SN

Real Time Clock Overview

The RX-8025SA:AA0:PURE SN is an I2C-bus interface real-time clock (RTC) module manufactured by Epson Timing. It features a built-in 32.768kHz crystal oscillator with high-precision adjustment, achieving a typical accuracy of ±23ppm at room temperature. The device operates within a supply voltage range of 1.7V to 5.5V and supports a maximum counting current of 1.2µA to 1.8µA at 3V to 5V. It includes functions such as clock precision adjustment, oscillation stop detection, power supply voltage monitoring, and two alarm systems. The component is housed in a 14-SOP (SOP-14) package with dimensions of 10.1mm x 5mm and complies with RoHS standards.

Real Time Clock Feature Summary

• Built-in 32.768kHz crystal oscillator with ±23ppm accuracy
• I2C bus interface supporting up to 400kHz
• Clock precision adjustment function for arbitrary calibration
• Dual alarm system and configurable periodic interrupts

Real Time Clock Applications

• Electric meters
• Gas meters
• Industrial control systems
• Security systems

Real Time Clock Procurement Notes

Verify the specific suffix :AA0 which denotes a ±23ppm accuracy variant, distinct from the :AA model's ±5ppm specification. Confirm the :PURE SN designation indicates compliance with lead-free manufacturing requirements. Check current availability status as distribution may vary between tube and cut-tape packaging formats depending on the supplier.

Real Time Clock Selection Notes

Select this model when moderate clock accuracy (±23ppm) is sufficient for cost-sensitive applications. Ensure the design accommodates the 14-pin SOP package footprint. Verify that the host microcontroller supports the required I2C protocol speeds. Consider the operating temperature range of -40°C to +85°C against environmental conditions.

Real Time Clock Part Context

This part belongs to the RX-8025SA series, characterized by the SA suffix indicating the SOP-14 package format. It differs from the RX-8025T which shares similar electrical characteristics but may have different pinout or feature configurations. The AA0 suffix specifically identifies the accuracy grade within the product line.

Real Time Clock Replacement Considerations

The PCF2127AT/2Y from NXP USA Inc. is listed as a similar replacement option. Engineers should verify pin compatibility and register mapping differences before substitution.