X1228V14-4.5A

Overview

The X1228V14-4.5A is a Real Time Clock (RTC) integrated circuit manufactured by Renesas Electronics Corporation, housed in a 14-TSSOP package. It integrates a clock/calendar function with an EEPROM and CPU supervisor. The device operates on a single supply voltage ranging from 2.7V to 5.5V, with battery backup support from 1.8V to 5.5V. It features an I2C, 2-wire serial interface for communication. The maximum current consumption during timing operation is specified between 10µA and 20µA at the operating voltage range of 2.7V to 5V. The component supports an industrial temperature range of -40°C to 85°C.

Feature Summary

• Integrates real-time clock/calendar functionality with non-volatile EEPROM storage and CPU supervision capabilities within a single chip.
• Utilizes a standard I2C 2-wire serial interface for simplified system connectivity and data access.
• Includes hardware features such as alarms, leap year compensation, and watchdog timer functions.

Applications

• Impedance instruments for generator rotator monitoring
• General-purpose embedded systems requiring timekeeping and data retention
• Industrial control equipment needing CPU supervision

Procurement Notes

Verify the specific suffix '4.5A' against official Renesas documentation, as standard listings often use suffixes like 'IZ-2.7A'. Confirm RoHS compliance status, as some variants are compliant while others may not be. Check for obsolescence notices, as this family has seen discontinuation events. Ensure the 14-TSSOP package matches your PCB footprint requirements before ordering.

Selection Notes

Select this component when a combined RTC, EEPROM, and supervisor solution is required to save board space. It is suitable for applications needing precise timekeeping with automatic leap year adjustment. Consider the I2C interface compatibility with your microcontroller. Verify that the 2.7V minimum supply voltage meets your system's power rails, or choose a variant supporting lower voltages if necessary.

Part Context

The X1228 belongs to a family of mixed-signal CMOS devices originally developed by Xicor and later acquired by Intersil, now under Renesas. These parts are designed to provide complete timing and memory solutions in compact packages. The V14 designation typically indicates the 14-pin TSSOP package variant within the broader X1228 product line.

Replacement Considerations

Public confirmed substitute part numbers include BU9873NUX-TTR from Rohm Semiconductor and DS1388Z-5+ from Analog Devices Inc./Maxim Integrated. Verify pinout and register compatibility before substitution.