X1228V14I-4.5A

Overview

The X1228V14I-4.5A is a Real-Time Clock (RTC) integrated circuit manufactured by Renesas Electronics Corporation, designed for precise timekeeping and calendar functions in electronic systems. It features an I²C/2-Wire Serial interface for communication and operates within a supply voltage range of 2.7V to 5.5V, with battery backup support from 1.8V to 5.5V. The device includes 4K (512 x 8) bits of EEPROM for data storage and supports both 12-hour and 24-hour time formats alongside YY-MM-DD-dd date formatting. It incorporates hardware features such as alarms, leap year compensation, a supervisor, and a watchdog timer. The component is housed in a 14-TSSOP surface-mount package and is rated for operation across a temperature range of -40°C to 85°C.

Feature Summary

• Integrates real-time clock and calendar functionality with non-volatile EEPROM storage for system data retention.
• Supports standard I²C/2-Wire Serial interface protocols for efficient digital communication.
• Includes dedicated hardware blocks for alarm generation, leap year adjustment, CPU supervision, and watchdog monitoring.

Applications

• Industrial control systems requiring reliable time-stamping and event logging
• Embedded devices needing continuous timekeeping during main power loss via battery backup
• Data acquisition systems utilizing internal EEPROM for configuration storage

Procurement Notes

This component is officially designated as obsolete by the manufacturer. Procurement must focus on verifying the authenticity of remaining stock or identifying qualified replacement parts. Buyers should confirm that any available units are genuine Renesas products and check for lead-free status compliance if required by specific environmental regulations. Due to the discontinued status, availability is limited to existing inventory or third-party distributors.

Selection Notes

Engineers selecting this part should prioritize its integrated supervisor and watchdog capabilities for robust system management. The dual voltage domains allow flexible design for both main power and battery-backed scenarios. Compatibility with I²C buses simplifies integration into microcontroller-based architectures. Designers must account for the obsolete status when planning long-term production runs, ensuring sufficient buffer stock or transitioning to alternative components early in the development cycle.

Part Context

The X1228 series represents Renesas' line of RTC ICs combining timing, calendar, and memory functions. This specific model utilizes the 14-TSSOP package variant, distinguishing it from SOIC versions like the X1228S14I. It belongs to the broader category of mixed-signal timing solutions aimed at providing complete timekeeping and system monitoring in a single compact footprint for space-constrained applications.

Replacement Considerations

Public confirmed substitute part numbers include DS1388Z-5+ from Analog Devices Inc./Maxim Integrated.

FAQ

What is the EEPROM capacity of the X1228V14I-4.5A?

The device contains 4K bits of EEPROM, organized as 512 bytes of 8-bit words.

Does the X1228V14I-4.5A support leap year calculations?

Yes, the component includes hardware logic for automatic leap year compensation.