X1228S14Z-2.7T1

Overview

The X1228S14Z-2.7T1 is an I2C Real-Time Clock (RTC) and calendar IC manufactured by Renesas Electronics Corporation. It operates within a supply voltage range of 2.7V to 5.5V and features a 14-SOIC package with a width of 0.154 inches (3.90mm). The device tracks time in hours, minutes, and seconds, and includes calendar registers for date, month, year, and day of the week, accurate through 2099 with automatic leap year correction. Key specifications include a maximum timekeeping current of 10µA to 20µA at 2.7V–5V and an operating temperature range of -40°C to 85°C.

Feature Summary

• I2C interface with 400kHz data transfer rate
• Automatic backup switching to battery or super capacitor upon power failure
• On-chip oscillator compensation using external 32.768kHz crystal
• Includes single alarm settable to second, minute, hour, day of week, day, or month

Applications

• Data logging systems requiring precise timestamping
• Battery-powered portable devices needing low-power timekeeping
• Industrial equipment with power failure detection requirements

Procurement Notes

Verify component status as obsolete. Confirm availability of replacement parts such as DS1388Z-5+ or BU9873NUX-TTR if sourcing from secondary markets. Ensure RoHS compliance matches specific project requirements, noting that some variants may not be compliant.

Selection Notes

Select this part for designs requiring pin-compatible replacements for ST M41Txx or Maxim DS13xx devices. Consider the 14-SOIC package constraint and verify battery backup voltage compatibility (1.8V ~ 5.5V) against system power rails.

Part Context

This component belongs to the X1228 family of real-time clocks. It shares functional similarities with other Renesas RTCs but is distinguished by its specific package type and interface configuration. The model suffix indicates voltage range and packaging details.

Replacement Considerations

Public confirmed substitutes include Analog Devices Inc./Maxim Integrated DS1388Z-5+ and Rohm Semiconductor BU9873NUX-TTR. Verify pinout compatibility and feature parity before integration.