X1227S8I-2.7AT1

Overview

The X1227S8I-2.7AT1 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 and 24-hour modes, and YY-MM-DD-dd date format. Key features include alarm capabilities, leap year compensation, a monitor function, 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. The maximum current consumption during timing is 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

• Integrated Real-Time Clock with Calendar functionality
• I2C, 2-Wire Serial Interface for communication
• Supports Alarm, Leap Year, Monitor, and Watchdog Timer features
• Operates on 2.7V to 5.5V supply with 1.8V to 5.5V battery backup

Applications

• Systems requiring precise timekeeping and calendar tracking via I2C
• Devices needing low-power RTC with battery backup capability
• Applications utilizing built-in watchdog timers for system reliability

Procurement Notes

Verify the exact part number suffix, as 'X1227S8IZ-2.7' appears in available documentation while 'X1227S8I-2.7AT1' was requested. Confirm RoHS compliance status, as related variants show mixed compliance records. Check for End-of-Life (EOL) notices, as similar Renesas RTC models have been discontinued. Ensure the 8-SOIC package matches the design requirements.

Selection Notes

Select this component if an I2C-connected RTC with integrated watchdog and alarm features is required. Verify that the 8-SOIC package fits the PCB layout constraints. Ensure the operating voltage range of 2.7V to 5.5V aligns with the system power rails. Consider the 1.8V minimum battery voltage for backup scenarios.

Part Context

This part belongs to the Renesas X1227 series of real-time clocks. It shares functional similarities with other models like the X1226 and X1228, differing primarily in package type and specific feature sets such as the inclusion of a watchdog timer. The series is designed for applications requiring reliable timekeeping with minimal external components.

Replacement Considerations

Publicly confirmed substitute part numbers for X1227S8I-2.7AT1 are not available in the provided source material. Related discontinued models like X1226S8I list ISL12026IBZ-T and PCA8565TS/1,118 as alternatives, but direct substitution requires verification against specific pinout and feature requirements.