RA-8565SA:B3 ROHS

Real Time Clock Overview

The RA-8565SA:B3 ROHS is an automotive-grade real-time clock module from Seiko Epson, designed for extended operating temperatures ranging from -40°C to +125°C. It integrates a frequency-adjusted 32.768 kHz crystal unit with an I2C-bus interface supporting up to 400 kHz. The device operates on a wide voltage range of 1.8 V to 5.5 V, with a timekeeper voltage range of 1.7 V to 5.5 V. Key features include full calendar and timer functions, alarm capabilities, and a programmable CLKOUT pin capable of outputting frequencies of 32.768 kHz, 1024 Hz, 32 Hz, or 1 Hz. It conforms to AEC-Q200 standards.

Real Time Clock Feature Summary

• Built-in frequency-adjusted 32.768 kHz crystal unit eliminates external tuning requirements.
• I2C-bus interface (400 kHz) with interrupt outputs for alarm and timer events.
• Automotive-grade reliability conforming to AEC-Q200 with operation up to +125°C.
• Programmable CLKOUT pin provides selectable output frequencies via N-ch open-drain.

Real Time Clock Applications

• Car audio systems
• Car navigation systems
• Clocks
• ECU sub clocks

Real Time Clock Procurement Notes

Verify the specific suffix 'B3' against official documentation to confirm the exact frequency stability rating, as standard datasheets may list general series parameters. Confirm RoHS compliance status directly with the manufacturer or authorized distributors, as ordering suffixes can impact environmental certifications. Ensure the component meets the required AEC-Q200 qualification if used in automotive safety-critical designs.

Real Time Clock Selection Notes

Select this model when an integrated crystal solution is required to save board space and reduce calibration complexity. The wide operating temperature range (-40°C to +125°C) makes it suitable for harsh automotive environments. Consider the low standby current consumption (max 1.8 µA at 5V/125°C) for battery-backed applications where power efficiency is critical.

Real Time Clock Part Context

This part belongs to the RA-8565SA series of real-time clock modules from Seiko Epson. The series is specifically engineered for automotive applications, offering high reliability and precision timing. The 'SA' designation typically refers to the SOP-14 package format, while the 'ROHS' suffix indicates compliance with environmental directives regarding restricted substances.

Real Time Clock Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided source material. When evaluating alternatives, ensure compatibility with the I2C protocol, voltage ranges (1.8V–5.5V), and package dimensions (SOP-14). Verify that any replacement also meets AEC-Q200 standards if the application requires automotive certification.