X1228V14

Overview

The X1228V14IZ-2.7A is a Real-Time Clock (RTC) integrated circuit manufactured by Renesas Electronics Corporation, belonging to the X1228 family. It provides clock/calendar functionality with an I2C, 2-wire serial interface. The device operates within a supply voltage range of 2.7V to 5.5V and supports battery backup from 1.8V to 5.5V. Timekeeping current consumption is specified at 10µA to 20µA depending on voltage. It features alarm capabilities, leap year compensation, a supervisor function, and a watchdog timer. The component is housed in a 14-TSSOP package with a width of 4.40mm and is rated for operation between -40°C and 85°C.

Feature Summary

• Integrated RTC with calendar functions supporting HH:MM:SS time format and YY-MM-DD-dd date format.
• Includes CPU supervisor and watchdog timer features for system monitoring.
• Supports I2C, 2-wire serial communication interface.
• Low power consumption with 10µA to 20µA current draw during timekeeping.

Applications

• Systems requiring precise timekeeping and calendar tracking via I2C.
• Applications needing CPU supervision and watchdog timer protection.
• Battery-backed real-time clock implementations in consumer or industrial electronics.

Procurement Notes

The X1228V14IZ-2.7A variant is listed as obsolete and no longer manufactured. Verification of availability should focus on surplus distributors or alternative sources. Ensure compatibility with existing PCB footprints and firmware drivers when sourcing replacements. Check RoHS compliance status, as specific suffixes may vary in environmental certification.

Selection Notes

Select this component for designs requiring a standalone RTC with supervisor functions in a small surface-mount package. Verify that the I2C bus speed and address configuration match the system requirements. Consider the operating temperature range of -40°C to 85°C for environmental suitability. Confirm that the 14-TSSOP package dimensions fit the mechanical constraints of the enclosure.

Part Context

This part belongs to the X1228 series, which combines RTC, EEPROM, and supervisor functions. Similar variants include the X1228S14I in a 14-SOIC package. The 'IZ' suffix typically denotes the TSSOP package and specific electrical characteristics, while '-2.7A' indicates the voltage range and revision. Previous generations were produced by Xicor and Intersil before acquisition.

Replacement Considerations

Publicly confirmed substitute part numbers include BU9873NUX-TTR from Rohm Semiconductor and DS1388Z-5+ from Analog Devices Inc./Maxim Integrated. These are listed as similar alternatives for the obsolete X1228V14IZ-2.7A. Verify pinout and register compatibility before substitution.