X1228S14I-4.5A

Overview

The Intersil X1228S14I-4.5A is a Real-Time Clock (RTC) IC integrating a clock/calendar and 32Kb EEPROM. It communicates via an I2C, 2-wire serial interface. The device operates with a main supply voltage of 4.5V to 5.5V and a battery backup range of 1.8V to 5.5V. Timing current consumption ranges from 10µA to 20µA at 2.7V to 5V. It supports date formats YY-MM-DD-dd and time formats HH:MM:SS in 12/24-hour modes. The component is housed in a 14-SOIC package (0.154", 3.90mm wide) and functions within a temperature range of -40°C to 85°C.

Feature Summary

• Integrated 32Kb EEPROM for data storage alongside RTC functionality
• Supports dual alarms, leap year compensation, and Y2K compliance
• Includes on-chip oscillator compensation and programmable watchdog timer
• Features power-fail detection and low-voltage reset output

Applications

• Industrial control systems requiring precise timekeeping
• Data logging equipment needing non-volatile memory retention
• Telecommunications infrastructure monitoring
• Embedded systems with I2C bus connectivity

Procurement Notes

Verify the specific suffix '4.5A' against official Intersil or Renesas documentation, as standard listings often cite 'X1228S14I'. Confirm RoHS compliance status, as some variants are marked non-compliant. Check moisture sensitivity level (MSL) ratings prior to surface mount assembly. Ensure the supplier provides valid traceability for this discontinued or legacy part number.

Selection Notes

Select this component when both real-time tracking and significant non-volatile storage are required in a single package. The 14-SOIC package suits applications with moderate pin count constraints. Verify that the 4.5V–5.5V VCC range aligns with the system's primary power rail. Consider the 10µA–20µA standby current for battery-backed designs.

Part Context

The X1228 series belongs to the 2-Wire™ family of RTCs manufactured by Intersil, now part of Renesas Electronics. This specific model combines calendar functions with substantial EEPROM capacity, distinguishing it from simpler RTC-only devices. The 'S14I' designation indicates the SOIC-14 package and industrial temperature grade.

Replacement Considerations

Public sources list DS1388Z-5+ (Analog Devices/Maxim Integrated) as a similar replacement for the base X1228S14I. Verify electrical compatibility and pinout alignment before substitution. No direct public substitute is confirmed specifically for the '4.5A' suffix variant.