X1227S8Z

Overview

The X1227S8Z 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 time formats of HH:MM:SS in both 12-hour and 24-hour modes, and date formats of YY-MM-DD-dd. Key features include an alarm function, leap year compensation, a watchdog timer, and a monitor timer. It operates within a supply voltage range of 2.7V to 5.5V, with a maximum timing current of 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 supporting HH:MM:SS and YY-MM-DD-dd formats
• I2C, 2-wire serial communication interface
• Includes alarm, leap year compensation, watchdog timer, and monitor timer features
• Operates on 2.7V to 5.5V supply with low power consumption (10µA ~ 20µa @ 2.7V ~ 5V)

Applications

• Systems requiring precise timekeeping and calendar tracking via I2C
• Devices utilizing watchdog timers for system stability monitoring
• Applications needing alarm functions triggered by specific time/date events

Procurement Notes

Verify the part status as discontinued before procurement planning. Confirm that the 8-SOIC package dimensions match the design footprint. Ensure the I2C address and register map compatibility with the host controller software. Check for RoHS compliance documentation if required by the manufacturing process.

Selection Notes

Select this component when an I2C-based RTC with additional supervisory features like watchdog and monitor timers is required. Compare against the X1226S8Z if the industrial temperature range (-40°C to 85°C) and extra timer features are not necessary, as the X1226S8Z offers commercial temperature range operation. Ensure the supply voltage aligns with the 2.7V to 5.5V operating window.

Part Context

The X1227S8Z belongs to the X1227 series of real-time clocks from Renesas. It shares the same core RTC functionality and pinout with variants like the X1227S8IZ, differing primarily in temperature rating or packaging suffixes. It is distinct from the X1205 series which lacks the watchdog and monitor timer features.