ISL12029IB30AZ

Real Time Clock Overview

The ISL12029IB30AZ is a low-power Real Time Clock/Calendar with I2C Bus and EEPROM. It tracks time in hours, minutes, and seconds, including day of the week, date, month, and year, accurate through 2099 with automatic leap year correction. The device features two non-volatile alarms, intelligent battery backup switching, and on-chip oscillator compensation. It includes 512x8 bits of EEPROM with BlockLock protection and CPU supervisor functions such as Power-On Reset and Watchdog Timer. Operating voltage ranges from 2.7V to 5.5V for VDD and 1.8V to 5.5V for VBAT.

Real Time Clock Feature Summary

• Real-Time Clock/Calendar with automatic leap year correction through 2099
• Two Non-Volatile Alarms settable to second, minute, hour, day, or month
• Integrated 512x8-bit EEPROM with 8 modes of BlockLock protection
• On-Chip Oscillator Compensation with 64-position trim capacitor

Real Time Clock Applications

• Utility Meters
• HVAC Equipment
• Network Routers, Hubs, Switches, Bridges
• POS Equipment
• Office Automation (Copiers, Fax)

Real Time Clock Procurement Notes

Verify the specific reset voltage threshold associated with the IB30 suffix, which corresponds to a nominal 3.09V trip point. Confirm package availability in 14-lead SOIC format. Check for moisture sensitivity level requirements during storage and handling. Ensure compatibility with the Legacy Mode power control settings defined for the standard ISL12029 series.

Real Time Clock Selection Notes

Select this part when a fixed 3.09V reset threshold is required for the host system. Compare against ISL12029A variants if the application requires Standard Mode power control or operates with VBAT greater than VDD. Ensure the external crystal matches the internal compensation range of ±30ppm. Verify that the 400kHz I2C speed meets the system bus requirements.

Real Time Clock Part Context

This component belongs to the ISL12029 family, distinguished by its Legacy Mode power control settings. It shares pinouts with ST M41Txx and Maxim DS13xx devices but integrates additional EEPROM and supervisor features. The IB30 variant specifically sets the VRESET threshold to approximately 3.09V, differentiating it from other voltage options in the series.

Real Time Clock Replacement Considerations

ISL12029IBZ: Offers a higher 4.38V reset threshold. ISL12029IV30AZ: Provides the same electrical characteristics in a TSSOP package instead of SOIC. ISL12029AIB30AZ: Uses Standard Mode power control settings suitable for VBAT > VDD applications.