ISL12029IVZ-T

Real Time Clock Overview

The ISL12029IVZ-T is a low-power real-time clock/calendar IC manufactured by Renesas Electronics Corporation. It features an I²C interface, 512x8-bit EEPROM, and intelligent battery backup switching. The device operates with a main supply voltage of 2.7V to 5.5V and a backup supply of 1.8V to 5.5V. Timekeeping current ranges from 10µA to 20µA depending on the VDD level. It includes two non-volatile alarms, CPU supervisor functions (Power-On Reset, Watchdog Timer), and on-chip oscillator compensation for a 32.768kHz crystal. The component is housed in a 14-lead TSSOP package.

Real Time Clock Feature Summary

• I²C Bus Interface supporting up to 400kHz data transfer rate
• Integrated 512x8-bit EEPROM with BlockLock™ protection and >2,000,000 cycle endurance
• On-chip oscillator compensation with 64-position digital trim capacitor for ±30ppm accuracy
• Intelligent battery backup switching with power-fail detection and 800nA battery supply current

Real Time Clock Applications

• Utility Meters
• HVAC Equipment
• Network Routers, Hubs, Switches, Bridges
• POS Equipment
• Test Meters/Fixtures

Real Time Clock Procurement Notes

Verify the specific reset voltage threshold associated with the 'IVZ' suffix against official datasheets, as this parameter varies across the ISL12029 family. Confirm that the tape and reel packaging aligns with automated assembly requirements. Ensure compatibility with the legacy mode settings defined for the standard ISL12029 variant rather than the ISL12029A standard mode.

Real Time Clock Selection Notes

Select this component when a 14-lead TSSOP package is required for space-constrained designs. Ensure the system design accommodates the specific VRESET threshold determined by the ordering suffix. Verify that the external 32.768kHz crystal load capacitance matches the internal compensation capabilities of the device for optimal frequency accuracy over the -40°C to +85°C operating range.

Real Time Clock Part Context

This part belongs to the ISL12029 series, which utilizes Legacy Mode Power Control Settings. It differs from the ISL12029A series, which uses Standard Mode Settings and is intended for applications where VBAT exceeds VDD. The 'IV' designation indicates the 14-lead TSSOP package, while the trailing 'Z' denotes lead-free/RoHS compliance. The '-T' suffix specifies tape and reel packaging.

Real Time Clock Replacement Considerations

Direct pin-compatible replacements within the same package include other ISL12029 variants with different reset thresholds (e.g., ISL12029IV27Z, ISL12029IV30AZ). Cross-family replacement with the ISL12029A series requires verification of power control mode differences.