X1228V14-2.7

Overview

The X1228V14-2.7 is an I²C Real-Time Clock (RTC) and calendar integrated circuit manufactured by Renesas Electronics Corporation. It tracks time in hours, minutes, and seconds, along with day of the week, date, month, and year, with automatic leap year correction through 2099. The device features a 400kHz I²C interface, single alarm capability, and power-fail detection. It operates on a main supply of 2.7V to 5.5V and supports battery backup from 1.8V to 5.5V. Key specifications include a maximum timekeeping current of 10µA to 20µA at 2.7V–5V and an operating temperature range of -40°C to 85°C. The component is housed in a 14-TSSOP package.

Feature Summary

• I²C Interface: Supports 400kHz data transfer rate for efficient communication.
• Calendar Functionality: Tracks time and date with automatic leap year correction valid through 2099.
• Power Management: Includes power-fail detection and intelligent battery backup switching; low standby current of 10µA–20µA.
• Alarm System: Features a single alarm settable to second, minute, hour, day of week, day, or month.

Applications

• Utility meters requiring precise time stamping and data logging.
• HVAC equipment needing scheduled operation and calendar tracking.
• Industrial control systems utilizing I²C-based monitoring and timing.

Procurement Notes

The X1228V14-2.7 is classified as obsolete and no longer manufactured. Verification of availability should focus on surplus distributors or existing stock rather than direct manufacturer orders. Alternative components such as the BU9873NUX-TTR or DS1388Z-5+ are identified as similar replacements. Ensure compatibility with voltage levels and pin configurations when sourcing substitutes.

Selection Notes

Select this component for applications requiring a low-power RTC with I²C connectivity and battery-backed operation. Verify that the system voltage aligns with the 2.7V–5.5V main supply range and that the 1.8V–5.5V battery backup range meets the design requirements. The 14-TSSOP package must be accommodated within the PCB layout constraints.

Part Context

This part belongs to the X1228 family of real-time clocks, which are designed to replace legacy devices like the ST M41Txx and Maxim DS13xx series due to pin compatibility. The 'V14' suffix typically denotes the 14-pin TSSOP package variant within this product line.

Replacement Considerations

Publicly confirmed substitute part numbers include BU9873NUX-TTR (Rohm Semiconductor) and DS1388Z-5+ (Analog Devices Inc./Maxim Integrated). These alternatives offer similar functionality but require verification of electrical parameters and pinout compatibility before integration.