X1226S8

Overview

The X1226S8 is a Real-Time Clock (RTC) integrated circuit manufactured by Renesas Electronics Corporation. It provides clock/calendar functionality with alarm and leap year features, supporting HH:MM:SS time formats in both 12-hour and 24-hour modes, and YY-MM-DD-dd date formats. The device communicates via an I2C, 2-wire serial interface. It operates within a supply voltage range of 2.7V to 5.5V, with battery backup support from 1.8V to 5.5V. Maximum current consumption during timekeeping is specified as 10µA to 20µA at 2.7V to 5V. The component is housed in an 8-SOIC package with a width of 3.90mm.

Feature Summary

• Integrated clock/calendar with alarm and leap year compensation
• I2C, 2-wire serial interface for communication
• Low power consumption: 10µA ~ 20µA @ 2.7V ~ 5V
• Wide operating temperature range: -40°C to 85°C

Applications

• Data logging systems requiring precise timestamping
• Industrial control equipment needing real-time tracking
• Consumer electronics with calendar and alarm functions

Procurement Notes

The X1226S8 series components are classified as obsolete or not recommended for new designs. Verification of availability should focus on surplus distributors or alternative replacement parts such as the ISL12026IBZ-T. Ensure compliance with RoHS standards if required, as older batches may not meet current environmental regulations.

Selection Notes

Select this RTC when I2C connectivity and low standby current are critical. Verify that the system voltage aligns with the 2.7V–5.5V operational range. Consider the 8-SOIC package constraints for PCB layout. For new designs, evaluate modern replacements like the ISL12026 due to the obsolete status of the X1226 series.

Part Context

The X1226S8 belongs to the X1226 family of real-time clocks from Renesas. It is designed for applications requiring accurate timekeeping with minimal power drain. The 'S8' suffix typically denotes the 8-SOIC package variant. This component serves as a foundational timing source for microcontroller-based systems.

Replacement Considerations

The ISL12026IBZ-T is a confirmed similar replacement offered by Renesas. The PCA8565TS/1,118 from NXP is also listed as a comparable alternative. Verify pin compatibility and register mapping before substitution.