X1228S14-2.7

Overview

The X1228S14-2.7 is a Real-Time Clock (RTC) and calendar integrated circuit manufactured by Renesas Electronics Corporation, belonging to the X1228 family. It features an I2C interface for communication and operates within a supply voltage range of 2.7V to 5.5V. The device tracks time in hours, minutes, and seconds, and includes calendar registers for day, month, year, and day of the week with automatic leap year correction through 2099. It incorporates battery-backed SRAM, a watchdog timer, and power-fail detection. The component is housed in a 14-SOIC package and supports an operating temperature range of -40°C to 85°C.

Feature Summary

• I2C Interface: Supports 400kHz data transfer rate for efficient communication.
• Calendar Functionality: Tracks time and date with automatic leap year correction through 2099.
• Battery Backup: Automatic switching between main power and battery/super capacitor sources.
• Supervisory Features: Includes watchdog timer, power-fail indicator, and on-chip oscillator compensation.

Applications

• Utility meters requiring precise timekeeping and data logging.
• HVAC equipment needing scheduled operations and calendar tracking.
• Industrial systems utilizing battery-backed memory for critical data retention.

Procurement Notes

The X1228S14-2.7 is classified as obsolete and no longer manufactured by Renesas. Verification of availability should focus on surplus distributors or confirmed replacement components such as the ISL1208 or DS13xx series equivalents. Ensure that any substitute part matches the 14-SOIC package and I2C interface requirements for direct integration.

Selection Notes

Select this component when a low-power RTC with integrated EEPROM/SRAM and supervisory functions is required. Verify compatibility with the 2.7V to 5.5V supply range and ensure the system design accommodates the 14-SOIC footprint. Consider the 10µA to 20µA maximum current consumption during timekeeping operations for battery life calculations.

Part Context

This part belongs to the X1228 family of real-time clocks, which are pin-compatible with Maxim DS13xx and ST M41Txx devices. The 'S14' suffix indicates the 14-pin SOIC package variant. The family is designed for applications requiring reliable timekeeping with non-volatile memory storage and power management features.

Replacement Considerations

Potential replacements include the ISL1208 or Maxim DS1388Z-5+. Verify pinout compatibility and register mapping before substitution. The ISL1208 offers similar functionality with potentially lower battery current consumption.