X1227S8I-2.7T1

Overview

The X1227S8I-2.7T1 is a Real-Time Clock (RTC) integrated circuit manufactured by Renesas Electronics Corporation, designed for precise timekeeping in electronic systems. It features an I2C serial interface and supports both 12-hour and 24-hour time formats alongside a YY-MM-DD-dd date format. The device operates within a supply voltage range of 2.7V to 5.5V and includes battery backup functionality supporting voltages from 1.8V to 5.5V. Key functional attributes include alarm capabilities, leap year compensation, a watchdog timer, and a monitor function. It is housed in an 8-SOIC package with a width of 3.90mm and maintains a maximum current consumption of 10µA to 20µA at operating voltages between 2.7V and 5V.

Feature Summary

• Integrated Real-Time Clock with I2C 2-wire serial interface
• Supports 12/24 hour time and YY-MM-DD-dd date formats
• Includes alarm, leap year, watchdog timer, and monitor features
• Operates on 2.7V–5.5V supply with 1.8V–5.5V battery backup

Applications

• Data logging systems requiring accurate timestamping
• Industrial control units needing real-time monitoring
• Consumer electronics with calendar and alarm functions

Procurement Notes

Verify component authenticity through authorized distributors as the part status is listed as obsolete. Confirm package integrity for the 8-SOIC form factor. Check RoHS compliance status against specific manufacturing dates, as legacy stock may vary. Ensure compatibility with existing I2C bus protocols before procurement.

Selection Notes

Select this component when a dedicated RTC with watchdog and alarm features is required in an 8-pin SOIC package. Verify that the I2C interface speed matches the system controller's capabilities. Consider the 2.7V minimum supply voltage for low-power applications. Compare against newer Renesas ISL12026 series if long-term availability is critical.

Part Context

This model belongs to the X1227 family of real-time clocks 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 'T1' suffix typically indicates tape and reel packaging, while 'S8I' denotes the 8-SOIC industrial temperature grade variant.

Replacement Considerations

The ISL12026IBZ-T is a documented similar replacement from Renesas. Verify pinout compatibility and register mapping differences before substitution. Alternative RTCs from other manufacturers require full electrical and software verification.