X1228S14IZ-2.7

Overview

The X1228S14IZ-2.7 is a Real-Time Clock (RTC) integrated circuit manufactured by Renesas Electronics Corporation, belonging to the X1228 family. It provides clock/calendar functionality with I2C and 2-wire serial interface support. The device operates within a supply voltage range of 2.7V to 5.5V and features battery backup capability from 1.8V to 5.5V. It is housed in a 14-SOIC package (0.154" width) and supports surface mount installation. The component includes timekeeping current consumption of 10µA to 20µA at 2.7V–5V and operates across an industrial temperature range of -40°C to 85°C.

Feature Summary

• Integrated Real-Time Clock/Calendar tracking hours, minutes, seconds, day, date, month, and year with automatic leap year correction through 2099.
• Supports I2C and 2-wire serial interfaces with up to 400kHz data transfer rate.
• Includes alarm functionality settable to second, minute, hour, day of week, day, or month, plus single event or pulse interrupt mode.
• Features power failure detection and automatic backup switching to battery or super capacitor.

Applications

• Data logging systems requiring precise timestamping.
• Industrial equipment needing real-time monitoring and scheduling.
• Consumer electronics with calendar and alarm functions.

Procurement Notes

Verify component authenticity as this part is marked obsolete. Check for RoHS compliance status, which may vary by production batch. Confirm package integrity upon receipt. Ensure compatibility with existing I2C bus protocols. Review datasheet for any specific handling requirements due to end-of-life status.

Selection Notes

Select this RTC when I2C connectivity and low power consumption are required. Consider the 14-SOIC package constraints for PCB layout. Verify that the 2.7V minimum supply voltage meets system requirements. Evaluate if the built-in alarm and watchdog timer features suffice for timing needs without external components.

Part Context

The X1228 series represents Renesas' line of low-power RTCs compatible with Maxim DS13xx and ST M41Txx pinouts. This specific model integrates non-volatile memory capabilities via battery backup. It is designed for applications requiring accurate timekeeping in portable and battery-operated devices.

Replacement Considerations

DS1388Z-5+ (Analog Devices Inc./Maxim Integrated) is listed as a similar replacement. BU9873NUX-TTR (Rohm Semiconductor) is another alternative for the TSSOP variant. Verify pinout compatibility and register mapping before substitution.

FAQ

What is the maximum data transfer rate for the I2C interface?

The I2C interface supports a data transfer rate of up to 400kHz.

Does the device support automatic leap year correction?

Yes, the calendar is accurate through 2099 with automatic leap year correction.

What is the battery supply voltage range?

The battery supply voltage range is 1.8V to 5.5V.