X1228V14I-2.7A

Overview

The X1228V14I-2.7A is an I²C Real-Time Clock (RTC) and calendar integrated circuit manufactured by Renesas Electronics Corporation. It 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 manages calendar data including day, date, month, and year with automatic leap year correction. It features a 14-TSSOP package and supports an operating temperature range of -40°C to 85°C. Maximum current consumption during timekeeping is specified between 10µA and 20µA at the nominal supply voltage.

Feature Summary

• I²C interface with 400kHz data transfer rate capability
• Automatic leap year correction accurate through 2099
• Integrated watchdog timer and power failure detection supervisor
• Single alarm settable to second, minute, hour, day, or month

Applications

• Utility meters requiring precise time tracking
• HVAC equipment with scheduling functions
• Industrial systems needing battery-backed real-time clocking

Procurement Notes

This component is classified as obsolete and no longer manufactured by Renesas Electronics Corporation. Verification of availability should focus on surplus distributors or existing stock rather than direct manufacturer orders. Buyers must confirm the authenticity of the source due to the discontinued status.

Selection Notes

Select this part for applications requiring a low-power RTC with I²C connectivity and a 14-pin surface-mount footprint. Ensure the design accommodates the 1.8V minimum battery voltage for backup operations. Verify that the system logic levels are compatible with the I²C bus requirements before integration.

Part Context

The X1228V14I-2.7A belongs to the X1228 family of real-time clocks. It shares pin compatibility with legacy devices such as the ST M41Txx and Maxim DS13xx series, facilitating drop-in replacements in existing designs. The 'V' suffix indicates the TSSOP package variant, while 'I' denotes the industrial temperature range.

Replacement Considerations

Publicly confirmed substitute part numbers for this specific obsolete model were not found in the provided documentation. Designers should evaluate newer Renesas RTC models or cross-reference with equivalent I²C RTCs offering similar pinouts and feature sets.