X1228S14-2.7T1

Overview

The X1228S14-2.7T1 is an obsolete Real-Time Clock (RTC) and calendar integrated circuit manufactured by Renesas Electronics Corporation. It features an I2C interface for communication and operates within a supply voltage range of 2.7V to 5.5V, with battery backup support from 1.8V to 5.5V. The device tracks time in hours, minutes, and seconds, and includes calendar registers for date, month, year, and day of the week, with automatic leap year correction through 2099. Key electrical parameters include a maximum timekeeping current of 10µA to 20µA at 2.7V to 5V and an operating temperature range of -40°C to 85°C. It is housed in a 14-SOIC package.

Feature Summary

• I2C Interface: Supports 400kHz data transfer rate for efficient serial communication.
• Calendar Functionality: Tracks time and date with automatic leap year correction through 2099.
• Low Power Consumption: Maximum timekeeping current of 10µA to 20µA at 2.7V to 5V.
• Integrated Features: Includes alarm capabilities, watchdog timer, power failure detection, and oscillator compensation.

Applications

• Utility meters requiring precise timekeeping and low power consumption.
• HVAC equipment needing calendar tracking and alarm functions.
• Industrial systems utilizing I2C-based monitoring and control architectures.

Procurement Notes

This component is officially classified as obsolete and no longer manufactured by Renesas Electronics Corporation. Verification of availability should focus on surplus distributors or secondary market sources rather than direct manufacturer orders. Buyers must confirm the authenticity and condition of existing stock, as lead times and pricing are subject to market fluctuations for end-of-life products.

Selection Notes

Designers seeking a replacement should consider components with compatible I2C interfaces and similar pinouts, such as those from the Maxim DS13xx series or ST M41Txx series, which offer functional equivalence. Ensure that the substitute part supports the required voltage ranges (2.7V–5.5V VCC, 1.8V–5.5V VBAT) and package type (14-SOIC). Verify that the alternative device meets the specific application requirements for alarm configurations and watchdog timer functionality.

Part Context

The X1228S14-2.7T1 belongs to the X1228 family of real-time clocks, which are designed for applications requiring accurate timekeeping with minimal power consumption. This specific variant utilizes a 14-SOIC package and includes additional features like a watchdog timer and power fail indicator compared to basic RTC models. The 'T1' suffix typically denotes tape-and-reel packaging, although the primary product status remains obsolete regardless of packaging format.

Replacement Considerations

Publicly confirmed substitutes include Analog Devices Inc./Maxim Integrated DS1388Z-5+ and Rohm Semiconductor equivalents. These parts offer similar I2C interfaces and RTC functionalities but may require verification of pin compatibility and software register mapping for seamless integration into existing designs.