ISL12029IV27AZ-T

Real Time Clock Overview

The ISL12029IV27AZ-T is a low-power Real Time Clock/Calendar IC manufactured by Renesas Electronics Corporation. It features an I²C interface, integrated 512x8-bit EEPROM, and intelligent battery backup switching. The device operates with a main supply voltage range of 2.7V to 5.5V and a backup supply range of 1.8V to 5.5V. Key electrical parameters include a maximum timekeeping current of 20µA at 5.5V and a battery supply current of 1.2µA at 3.0V. It utilizes an external 32.768kHz crystal and provides automatic leap year correction through the year 2099.

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 ±30ppm accuracy.
• CPU Supervisor functions including Power-On Reset (VRESET = 2.92V) 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 associated with the '27' suffix during procurement. Confirm that the '-T' suffix indicates Tape and Reel packaging as per manufacturer specifications. Ensure compatibility with the Legacy Mode Setting required for this part number compared to the ISL12029A series.

Real Time Clock Selection Notes

Select this component when a VRESET threshold of approximately 2.92V is required for system supervision. The 'IV' package designation indicates a 14-lead TSSOP form factor. Ensure the application supports the Legacy Mode power control settings, as this differs from the Standard Mode used in ISL12029A variants.

Real Time Clock Part Context

This part belongs to the ISL12029 family of real-time clocks. The 'IV' prefix denotes the 14-lead TSSOP package, while the '27' suffix specifies the 2.92V reset voltage threshold. The 'AZ' indicates RoHS compliance and lead-free construction. The '-T' suffix designates the reel packaging format.

Real Time Clock Replacement Considerations

ISL12029IB27AZ-T: Identical functionality in a 14-lead SOIC package instead of TSSOP. ISL12029IV30AZ-T: Same package and features but with a 3.09V reset voltage threshold.