X1228V14Z-4.5A

Overview

The X1228V14Z-4.5A is a discontinued Real-Time Clock (RTC) integrated circuit manufactured by Renesas Electronics Corporation. It combines a clock/calendar function with an I2C interface and embedded EEPROM memory. The device operates within a supply voltage range of 2.7V to 5.5V and features a 14-SOIC package. Key technical specifications include a maximum current consumption of 10µA to 20µA at 2.7V to 5V, an operating temperature range of -40°C to 85°C, and support for 12/24-hour time formats with automatic leap year correction.

Feature Summary

• Integrated Real-Time Clock/Calendar with I2C serial interface
• Embedded EEPROM memory for data storage
• Automatic backup switching to battery or super capacitor
• Features alarms, watchdog timer, and power-fail detection

Applications

• Power management systems requiring precise timing
• Industrial equipment with I2C communication needs
• Consumer electronics utilizing RTC functionality

Procurement Notes

This component is officially obsolete and no longer in production. Verification of availability should focus on distributor surplus stock rather than direct manufacturer orders. Buyers must confirm the specific suffix 'V14Z' indicates lead-free status if required, though RoHS compliance may vary based on manufacturing date. Cross-referencing with active replacement parts is recommended for new designs.

Selection Notes

Designers should evaluate the I2C interface compatibility and voltage levels (2.7V–5.5V) against system requirements. The 14-SOIC package dimensions (3.90mm width) must be verified for PCB layout constraints. Consider the trade-off between the embedded EEPROM capacity and external memory options if higher storage density is needed.

Part Context

The X1228 series represents Renesas's legacy line of RTCs with EEPROM. The 'V14Z' suffix typically denotes a specific packaging and environmental compliance variant within this family. This part shares functional similarities with other industry-standard RTCs but is distinct in its specific pinout and register map configuration.

Replacement Considerations

Publicly confirmed substitute: DS1388Z-5+ (Analog Devices Inc./Maxim Integrated). Verify pin-to-pin compatibility and register mapping differences before implementation.