X1228V14I-2.7

Overview

The X1228V14I-2.7 is a Real-Time Clock (RTC) integrated circuit manufactured by Renesas Electronics Corporation, belonging to the X1228 family. It provides clock/calendar functionality via an I²C, 2-wire serial interface. The device supports time formats of HH:MM:SS in both 12-hour and 24-hour modes, and date formats of YY-MM-DD-dd with automatic leap year correction. It operates within a supply voltage range of 2.7V to 5.5V, with battery backup support from 1.8V to 5.5V. The maximum current consumption during timekeeping is specified as 10µA to 20µA at 2.7V to 5V. The component is housed in a 14-TSSOP package with a width of 4.40mm and is rated for an operating temperature range of -40°C to 85°C.

Feature Summary

• Integrated real-time clock and calendar with I²C interface
• Automatic leap year correction through 2099
• Supports alarm functions and watchdog timer
• Low power consumption: 10µA ~ 20µa @ 2.7V ~ 5V

Applications

• Utility meters requiring precise time tracking
• HVAC equipment with scheduling needs
• Industrial systems needing watchdog timer protection

Procurement Notes

The X1228V14I-2.7 is listed as obsolete or not recommended for new designs. Verification of availability should focus on surplus distributors or existing stock holders. Confirm RoHS compliance status, as some variants in this series may differ. Ensure the specific suffix 'I' indicates the correct industrial temperature grade (-40°C to 85°C) and 'V14' denotes the TSSOP package before procurement.

Selection Notes

Select this component when an I²C RTC with built-in watchdog timer and alarm features is required in a 14-TSSOP package. Compare against the ISL12026 if EEPROM storage is needed, as the X1228 lacks integrated non-volatile memory. Verify that the 1.8V minimum battery voltage meets the system's backup requirements. Ensure the host microcontroller supports the I²C protocol used by the device.

Part Context

The X1228V14I-2.7 is part of the broader X1228 series of real-time clocks. This series typically includes variants with different packages (such as SOIC) and temperature ranges. The 'V14' suffix specifically identifies the 14-pin TSSOP package, while 'I' denotes the industrial temperature range. It serves as a timing solution for embedded systems requiring low-power, accurate timekeeping without external oscillators.

Replacement Considerations

Publicly confirmed substitutes include the BU9873NUX-TTR from Rohm Semiconductor and the DS1388Z-5+ from Analog Devices Inc./Maxim Integrated. These alternatives offer similar I²C RTC functionality but may require verification of pin compatibility and feature parity.