X1227S8I

Overview

The X1227S8I is a Real-Time Clock (RTC) integrated circuit manufactured by Renesas Electronics Corporation. It provides clock/calendar functionality with an I2C, 2-wire serial interface. The device supports HH:MM:SS time format in both 12/24-hour modes and YY-MM-DD-dd date format. Key features include an alarm function, leap year compensation, a monitor, and a watchdog timer. It operates within a supply voltage range of 2.7V to 5.5V, with battery backup support from 1.8V to 5.5V. Current consumption during timing is specified as 10µA to 20µA at 2.7V to 5V. The component is housed in an 8-SOIC package (0.154", 3.90mm width) and functions across a temperature range of -40°C to 85°C.

Feature Summary

• Real-time clock/calendar with I2C 2-wire serial interface
• Supports 12/24 hour time format and YY-MM-DD-dd date format
• Includes alarm, leap year compensation, monitor, and watchdog timer
• Operates on 2.7V to 5.5V supply with 1.8V to 5.5V battery backup

Applications

• Clock/calendar systems requiring low power consumption
• Devices needing precise timekeeping with alarm capabilities
• Systems utilizing I2C communication for data logging or control

Procurement Notes

The X1227S8I is listed as obsolete and no longer manufactured. Verification of availability should focus on aftermarket sources or potential replacement components such as the ISL12026IBZ-T. Ensure compatibility with existing designs when considering substitutes, as direct replacements may require schematic adjustments.

Selection Notes

Select this component for applications requiring a dedicated RTC with I2C interface and standard SOIC packaging. Verify that the operating voltage range of 2.7V to 5.5V aligns with the system design. Consider the 10µA to 20µA current consumption for battery-powered projects. Note that the part is obsolete; evaluate alternative parts if long-term supply stability is required.

Part Context

The X1227S8I belongs to the X1227 series of real-time clocks from Renesas. It shares functional similarities with other RTCs in the family but is distinguished by its specific package and feature set including watchdog timer and monitor. As an obsolete part, it serves as a reference for legacy designs or maintenance of existing equipment.

Replacement Considerations

The ISL12026IBZ-T is identified as a similar replacement option available from Renesas. Evaluate pinout compatibility and feature parity before substitution.