X1227S8IZ-2.7AT1

Overview

The X1227S8IZ-2.7AT1 is a Real-Time Clock (RTC) integrated circuit manufactured by Renesas Electronics Corporation, belonging to the X1227 series. It provides clock/calendar functionality with alarm capabilities, leap year compensation, supervisor functions, and a watchdog timer. The device supports I2C and 2-wire serial interfaces for communication. It operates within a supply voltage range of 2.7V to 5.5V on the main supply and 1.8V to 5.5V on the battery input. Timekeeping current consumption ranges from 10µA to 20µA at 2.7V to 5V. The component is housed in an 8-SOIC package (0.154", 3.90mm width) and is rated for operation between -40°C and 85°C.

Feature Summary

• Integrated RTC with calendar, alarm, supervisor, and watchdog timer features
• Dual interface support: I2C and 2-Wire Serial
• Low power consumption: 10µA ~ 20µa @ 2.7V ~ 5V
• Wide operating temperature range: -40°C to 85°C

Applications

• Data logging systems requiring precise time stamping
• Battery-backed real-time clock applications
• Industrial control systems needing watchdog supervision
• Consumer electronics with calendar and alarm functions

Procurement Notes

Verify component authenticity through authorized distributors or direct manufacturer channels. Confirm RoHS compliance status as per latest datasheet revisions. Check for obsolescence notices or end-of-life (EOL) announcements from Renesas Electronics. Ensure packaging specifications match design requirements, noting the 8-SOIC form factor.

Selection Notes

Select this part when both I2C and 2-Wire Serial compatibility are required. Verify that the 2.7V minimum supply voltage aligns with system power rails. Consider the 8-SOIC package constraints for PCB layout. Evaluate if the integrated supervisor and watchdog features reduce the need for external components compared to basic RTCs.

Part Context

This model is part of the X1227 family of real-time clocks. It shares functional similarities with the X1228 series but differs in package options and specific interface configurations. The 'AT1' suffix typically indicates tape and reel packaging, distinguishing it from tube-packaged variants like the X1227S8IZ-2.7.

Replacement Considerations

Direct substitutes may include other Renesas X1227 variants with different packaging. Cross-vendor replacements require verification of I2C/2-Wire compatibility and pinout alignment. Check for updated models in the X1228 series if additional features are needed.