X1227S8T1

Overview

The X1227S8T1 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 operates within a supply voltage range of 2.7V to 5.5V and supports battery backup from 1.8V to 5.5V. Key features include alarm capabilities, leap year compensation, a monitor function, and a watchdog timer. Time format supports HH:MM:SS in both 12/24-hour modes, while the date format is YY-MM-DD-dd. The maximum current consumption during timing is 10µA to 20µA at 2.7V to 5V. It is housed in an 8-SOIC package (0.154", 3.90mm width) and is rated for industrial temperature ranges.

Feature Summary

• Integrated Real-Time Clock with Calendar functionality
• I2C, 2-Wire Serial Interface
• Alarm, Leap Year, Monitor, and Watchdog Timer features
• Supply Voltage: 2.7V ~ 5.5V; Battery Backup: 1.8V ~ 5.5V

Applications

• Industrial control systems requiring precise timekeeping
• Data logging equipment needing calendar functions
• Consumer electronics with low-power RTC requirements

Procurement Notes

Verify component authenticity through authorized distributors or direct manufacturer channels. Confirm RoHS compliance status as historical data indicates potential non-compliance for older batches. Check for End-of-Life (EOL) notices and lead times due to discontinuation risks associated with legacy Renesas RTC families.

Selection Notes

Select this component when an I2C-compatible RTC with integrated watchdog and alarm features is required. Ensure the system design accommodates the 8-SOIC package dimensions. Verify that the operating voltage range aligns with the main system power rails and that the battery backup voltage meets the 1.8V minimum requirement for continuous operation.

Part Context

This part belongs to the X1227 series of real-time clocks from Renesas. It shares functional similarities with other members like the X1226 and X1228 but differs in package options and specific feature sets such as the inclusion of a watchdog timer and monitor. It is designed for applications needing standalone timekeeping without complex microcontroller integration.

Replacement Considerations

Public confirmed substitute part numbers are not available in the provided source material. Consult Renesas documentation for pin-compatible or functionally equivalent alternatives if this specific part number is discontinued.