ISL12029IVAZ

Real Time Clock Overview

The ISL12029IVAZ is a low-power Real Time Clock/Calendar manufactured by Renesas Electronics Corporation, housed in a 14-lead TSSOP package. It features an I²C bus interface with a maximum data transfer rate of 400kHz and integrates 512x8-bit EEPROM. The device operates on a main supply voltage (VDD) ranging from 2.7V to 5.5V and supports battery backup (VBAT) from 1.8V to 5.5V. Key electrical parameters include a typical battery supply current of 800nA at 1.8V and a timekeeping current of 10µA to 20µA depending on the VDD level.

Real Time Clock Feature Summary

• Integrated 512x8-bit EEPROM with BlockLock protection and >2,000,000 cycle endurance.
• Automatic battery backup switching with power-fail detection and intelligent switching logic.
• On-chip oscillator compensation with a 64-position digitally controlled trim capacitor for ±30ppm accuracy.
• 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 required for the application, as the 'IVAZ' suffix corresponds to a 4.64V reset voltage level. Confirm that the 14-lead TSSOP package dimensions align with the target PCB footprint. Ensure the design accommodates the open-drain nature of the SDA, SCL, and RESET pins by providing appropriate pull-up resistors.

Real Time Clock Selection Notes

Select this component when a 4.64V VDD undervoltage lockout threshold is necessary. Compare against the ISL12029IBAZ if a SOIC package is preferred over TSSOP. Note that the ISL12029 uses Legacy Mode settings; verify compatibility with systems designed for the Standard Mode found in the ISL12029A series.

Real Time Clock Part Context

This part belongs to the ISL12029 family of real-time clocks. It is distinct from the ISL12029A variant, which utilizes different power control settings and lower VBAT trip points. The IVAZ designation specifically identifies the TSSOP package and the 4.64V reset threshold configuration within the standard ISL12029 line.

Real Time Clock Replacement Considerations

The ISL12029IBAZ is a pin-compatible alternative offering the same electrical characteristics in a 14-lead SOIC package instead of TSSOP. Other variants like ISL12029IV30AZ provide the same package but with a lower 3.09V reset threshold.