X1228S14-4.5A

Overview

The X1228S14-4.5A is a Real Time Clock (RTC) integrated circuit manufactured by Renesas Electronics Corporation. It features an I²C, 2-Wire Serial interface and is housed in a 14-SOIC package with dimensions of 0.154 inches (3.90mm) width. The device integrates clock/calendar functionality, CPU supervision, and a watchdog timer. It includes 4K (512 x 8) bits of static RAM for data storage. The component operates within a supply voltage range of 2.7V to 5.5V and supports battery backup from 1.8V to 5.5V. It offers alarm capabilities, leap year correction, and time formats including HH:MM:SS in both 12/24-hour modes and YY-MM-DD-dd date formats.

Feature Summary

• Integrates real-time clock/calendar functions with CPU supervision and watchdog timer capabilities
• Includes 512 bytes of static RAM for non-volatile data storage
• Supports I²C 2-Wire Serial interface for system communication
• Provides alarm features and automatic leap year correction

Applications

• Data logging systems requiring precise time stamping
• Embedded devices needing calendar and timekeeping functions
• Industrial equipment with CPU supervision requirements
• Consumer electronics utilizing I²C communication protocols

Procurement Notes

Verify the specific suffix '-4.5A' against official Renesas documentation to confirm operational temperature range and packaging details, as datasheets may list variations such as industrial or commercial grades. Confirm RoHS compliance status, as some sources indicate non-compliance for certain variants. Ensure compatibility with the target system's I²C bus voltage levels and check for end-of-life status before finalizing procurement plans.

Selection Notes

Select this component when a combined RTC, RAM, and supervisor solution is required in a single package. It is suitable for applications needing low-power timekeeping with battery backup support. Consider the 14-SOIC footprint constraints and verify that the I²C interface speed matches the host microcontroller's capabilities. Evaluate the need for the integrated watchdog timer and alarm functions to determine if this integration reduces bill-of-materials complexity compared to discrete solutions.

Part Context

The X1228S14 series belongs to Renesas' family of real-time clock ICs that integrate memory and supervision functions. This specific model combines timing accuracy with system monitoring features, reducing the component count in embedded designs. It is designed for applications where space efficiency and functional integration are prioritized over standalone timing modules.

Replacement Considerations

The DS1388Z-5+ from Analog Devices Inc./Maxim Integrated is listed as a similar substitute part number.