X1227S8I-2.7AT2

Overview

The X1227S8I-2.7AT2 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 12/24-hour modes and YY-MM-DD-dd date format. Key features include alarm capabilities, leap year compensation, a watchdog timer, and a monitor function. 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
• Alarm, Leap Year, Watchdog Timer, and Monitor features
• Supply Voltage: 2.7V ~ 5.5V; Battery Backup: 1.8V ~ 5.5V

Applications

• Clock/Calendar systems requiring low power consumption
• Industrial control systems needing watchdog timer protection
• Data logging devices with RTC synchronization

Procurement Notes

Verify the specific suffix 'T2' against official Renesas documentation to confirm tape-and-reel packaging status, as standard listings often indicate tube packaging for this series. Confirm RoHS compliance status, as previous iterations of the X1226/X1227 family have shown mixed compliance records in public databases. Check for obsolescence notices, as similar models in this product line are marked as discontinued in distributor catalogs.

Selection Notes

Select this component when an I2C-connected RTC with built-in watchdog and monitor functions is required. Ensure the system design accommodates the 8-SOIC package dimensions (0.154" width). Verify that the operating voltage aligns with the 2.7V to 5.5V range. Consider the 10µA to 20µA current consumption for battery life calculations in low-power applications.

Part Context

This part belongs to the X1227 series of Real-Time Clock ICs from Renesas. It shares functional similarities with the X1226 and X1228 series but differs in package options and specific feature sets like the watchdog timer. The 'S8I' designation typically indicates the 8-SOIC package and industrial temperature range.

Replacement Considerations

Public data lists ISL12026IBZ-T (Renesas) and PCA8565TS/1,118 (NXP) as substitutes for the related X1226S8I model. Verify pin compatibility and feature parity before substituting the X1227S8I-2.7AT2.