X1228V14Z-2.7

Overview

The X1228V14Z-2.7 is a real-time clock (RTC) integrated circuit manufactured by Renesas Electronics Corporation, belonging to the X1228 family. It provides precise timekeeping and calendar functions via an I²C interface. The device operates with a main supply voltage of 2.7V to 5.5V and supports battery backup from 1.8V to 5.5V. Key features include automatic leap year correction, alarm capabilities, and power-fail detection. It is housed in a 14-TSSOP package and is rated for industrial temperatures ranging from -40°C to 85°C.

Feature Summary

• I²C Interface: Supports 400kHz data transfer rate for efficient communication.
• Calendar Functionality: Tracks hours, minutes, seconds, day of week, date, month, and year with automatic leap year correction through 2099.
• Low Power Consumption: Maximum current consumption of 10µA to 20µA during timekeeping at 2.7V to 5V.
• Advanced Features: Includes single alarm settable to second/minute/hour/day/month, watchdog timer, and supervisor function.

Applications

• Industrial systems requiring precise time synchronization.
• Consumer electronics needing low-power clock/calendar functionality.
• Data logging equipment with power-fail detection requirements.
• Embedded systems utilizing I²C communication protocols.

Procurement Notes

The X1228V14Z-2.7 is officially classified as obsolete and no longer manufactured by Renesas Electronics Corporation. Procurement is limited to existing stock or secondary market sources. Verification of part authenticity and condition is critical due to the end-of-life status. Buyers should confirm compatibility with replacement components such as the BU9873NUX-TTR if new production units are required.

Selection Notes

Select this component when an I²C-based RTC with battery-backed SRAM and industrial temperature range (-40°C to 85°C) is required. Ensure the design accommodates the 14-TSSOP package dimensions (0.173" width). Verify that the system voltage aligns with the 2.7V–5.5V operating range. Consider pin-compatible alternatives like the BU9873NUX-TTR if long-term supply stability is a priority.

Part Context

This part belongs to the X1228 series of real-time clocks, which are designed to be pin-compatible with legacy devices such as the ST M41Txx and Maxim DS13xx families. This compatibility facilitates drop-in replacements in existing designs. The V14 suffix indicates the 14-TSSOP package variant, while Z typically denotes lead-free/RoHS compliance within the manufacturer's coding scheme.

Replacement Considerations

The BU9873NUX-TTR by Rohm Semiconductor is listed as a similar alternative. Designers should verify electrical parameter alignment, particularly supply voltage ranges and interface timing, before substitution.