X1228V14-2.7A

Overview

The X1228V14-2.7A is an obsolete Real-Time Clock (RTC) IC manufactured by Renesas Electronics Corporation, belonging to the X1228 family. It provides clock/calendar functionality with a 14-TSSOP surface-mount package. The device supports I2C and 2-wire serial interfaces for data transfer. Key electrical specifications include a main supply voltage range of 2.7V to 5.5V and a battery backup supply range of 1.8V to 5.5V. Maximum timekeeping current consumption is specified between 10µA and 20µA at operating voltages of 2.7V to 5V. The component operates within a temperature range of -40°C to 85°C.

Feature Summary

• Integrated real-time clock and calendar tracking hours, minutes, seconds, day of week, date, month, and year with automatic leap year correction.
• Supports multiple alarm configurations settable to second, minute, hour, day of week, day, or month.
• Includes on-chip oscillator compensation and power failure detection features.
• Features a watchdog timer and supervisor function for system monitoring.

Applications

• Industrial control systems requiring precise timekeeping.
• Consumer electronics with battery-backed memory requirements.
• Automotive infotainment and instrument clusters.
• Network equipment needing synchronized clock sources.

Procurement Notes

This part number is officially classified as Obsolete and no longer in production. Verification of availability should focus on surplus distributors or secondary markets rather than direct manufacturer stock. Buyers must confirm the authenticity of existing inventory due to the discontinued status. Replacement components from the same family or compatible RTCs should be evaluated for pin-to-pin compatibility and functional equivalence before procurement.

Selection Notes

Designers selecting this component should note its discontinuation status. When replacing, verify that the substitute supports the required I2C interface speed and voltage levels (2.7V–5.5V). Ensure the replacement package matches the 14-TSSOP form factor if board space is constrained. Check if the alternative offers similar low-power battery backup characteristics (1.8V–5.5V) and includes necessary features like watchdog timers or alarms if used in critical applications.

Part Context

The X1228V14-2.7A is part of the broader X1228 series of low-power RTCs. Variants in this series typically differ by package type (e.g., SOIC vs. TSSOP) or specific feature sets. This model specifically utilizes the 14-TSSOP package. Other models in the family may offer different interface options or memory sizes, but share common core RTC functionalities such as calendar tracking and alarm generation.

Replacement Considerations

Publicly confirmed substitutes include the BU9873NUX-TTR by Rohm Semiconductor and the DS1388Z-5+ by Analog Devices Inc./Maxim Integrated. These alternatives are listed as similar replacements for the discontinued X1228 series components.