X1228V14IZ-4.5A

Overview

The X1228V14IZ-4.5A is a Real Time Clock (RTC) and Calendar IC manufactured by Renesas Electronics Corporation, belonging to the X1228 family. It integrates an I²C interface for communication with host processors. The device provides timekeeping functions including seconds, minutes, hours, day, date, month, and year, with automatic leap year compensation up to 2100. It features a built-in CPU supervisor and watchdog timer for system reliability. The component operates within a supply voltage range of 2.7V to 5.5V and supports battery backup operation from 1.8V to 5.5V. It is housed in a 14-TSSOP surface-mount package.

Feature Summary

• Integrated Real Time Clock/Calendar with I²C (2-Wire Serial) interface
• Built-in CPU Supervisor and Watchdog Timer for system protection
• Automatic Leap Year Compensation valid through 2100
• Low power consumption: 10µA to 20µA max current at 2.7V–5V

Applications

• Impedance instruments for generator rotators
• Data logging systems requiring precise timestamping
• Embedded controllers needing CPU supervision and timing

Procurement Notes

The X1228V14IZ-4.5A is classified as obsolete and no longer manufactured by Renesas Electronics Corporation. Sourcing new units directly from the manufacturer is not possible. Verification of availability should focus on distributor stock or authorized secondary market suppliers. Buyers must confirm the authenticity of available inventory due to the discontinued status.

Selection Notes

When selecting this component, note that it is part of the legacy X1228 series. Ensure the design accommodates the 14-TSSOP package dimensions (0.173 inch width). Verify that the system voltage requirements align with the 2.7V to 5.5V operating range. Since the part is obsolete, evaluate alternative RTCs with similar I²C interfaces and supervisor features if long-term supply stability is required.

Part Context

This device is part of the X1228 family, originally developed by Xicor and later acquired by Intersil, which was subsequently acquired by Renesas Electronics. The family combines RTC functionality with EEPROM storage and CPU management features in a single low-power CMOS chip. The 'V14IZ' suffix typically denotes the specific voltage grade and TSSOP package variant within this lineage.

Replacement Considerations

Publicly documented substitutes include the BU9873NUX-TTR from Rohm Semiconductor. This alternative offers similar RTC and I²C interface capabilities. Designers should verify pin compatibility and register mapping before substitution.