X1227S8-2.7A

Overview

The X1227S8-2.7A is a Real-Time Clock (RTC) integrated circuit manufactured by Renesas Electronics Corporation, designed for precise timekeeping in electronic systems. It features an I2C serial interface and supports both 12-hour and 24-hour time formats alongside a YY-MM-DD-day date format. The device includes hardware capabilities for alarms, leap year compensation, a watchdog timer, and a monitor function. It operates within a supply voltage range of 2.7V to 5.5V and is housed in an 8-SOIC package.

Feature Summary

• Integrated Real-Time Clock with Calendar functionality supporting HH:MM:SS and YY-MM-DD-dd formats
• I2C, 2-wire serial communication interface for system connectivity
• Built-in alarm generator, watchdog timer, and power monitor functions
• Automatic leap year compensation logic

Applications

• Data logging systems requiring accurate timestamping
• Industrial control equipment needing real-time monitoring
• Consumer electronics with calendar and clock display requirements
• Battery-powered devices utilizing low standby current

Procurement Notes

Verify component authenticity through authorized distributors as the market contains counterfeit variants. Confirm the specific suffix 'A' matches design requirements, as it may indicate specific manufacturing revisions or packaging variations. Check RoHS compliance status against local regulatory standards before integration into final products.

Selection Notes

Select this model when an I2C-compatible RTC with integrated watchdog and alarm features is required. Ensure the system voltage falls within the 2.7V to 5.5V operating range. Consider the 8-SOIC package dimensions for PCB layout constraints. Verify that the I2C bus speed compatibility meets the system's data transfer requirements.

Part Context

This component belongs to the X1227 series of Real-Time Clocks from Renesas. It shares functional similarities with other parts in the family but is distinguished by its specific voltage threshold and package configuration. The series is commonly used in applications where maintaining time accuracy during power interruptions is critical.

Replacement Considerations

Direct pin-to-pin replacements should be verified against official substitution lists. Alternative RTCs must match the I2C interface, voltage range, and package type. Functionality differences in watchdog timers or alarm precision may require firmware adjustments if using non-equivalent substitutes.