ISL12029IV27AZ

Real Time Clock Overview

The ISL12029IV27AZ is a low-power Real Time Clock (RTC) and calendar IC manufactured by Renesas Electronics Corporation. It features an I²C interface, integrated 512x8-bit EEPROM, and intelligent battery backup switching. The device operates on a main supply of 2.7V to 5.5V and supports battery backup from 1.8V to 5.5V. Key specifications include a maximum timekeeping current of 20µA at 5.5V and a battery supply current of 1000nA at 3.0V. It utilizes an external 32.768kHz crystal and includes oscillator compensation for accuracy within ±30ppm.

Real Time Clock Feature Summary

• Integrated 512x8-bit EEPROM with BlockLock™ protection and >2,000,000 cycle endurance.
• Intelligent battery backup switching with power-fail detection and 800nA typical battery supply current.
• On-chip oscillator compensation with 64-position digital trim capacitors for frequency adjustment.
• CPU Supervisor functions including Power-On Reset, Low Voltage Sense, and Watchdog Timer.

Real Time Clock Applications

• Utility Meters
• HVAC Equipment
• Network Routers, Hubs, Switches, Bridges

Real Time Clock Procurement Notes

Verify the specific VRESET threshold of 2.92V required for this variant during design validation. Confirm package compatibility with the 14-lead TSSOP footprint. Check datasheet revisions for any updates regarding moisture sensitivity levels or manufacturing site changes before finalizing procurement plans.

Real Time Clock Selection Notes

Select the ISL12029IV27AZ when a VRESET threshold of approximately 2.92V is necessary for system supervision. Ensure the application requires the Legacy Mode Setting characteristic of the ISL12029 series rather than the Standard Mode of the ISL12029A series. Verify that the 14-lead TSSOP package meets the board space constraints.

Real Time Clock Part Context

This component belongs to the ISL12029 family of real-time clocks. The 'IV' suffix indicates the 14-lead TSSOP package, while '27' specifies the 2.92V reset voltage threshold. The 'AZ' suffix denotes RoHS compliance and lead-free packaging. It is distinct from the SOIC package variants and the ISL12029A series which uses different power control settings.

Real Time Clock Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided documentation. Designers should verify pinout and electrical parameter compatibility if considering alternative RTCs from other manufacturers.