ISL12027IVAZ

Real Time Clock Overview

The ISL12027IVAZ is a Real Time Clock/Calendar integrated circuit manufactured by Renesas Electronics Corporation. It features an I2C interface, 512-bit EEPROM, and operates within a voltage range of 2.7V to 5.5V for VDD and 1.8V to 5.5V for battery backup. The device maintains timekeeping with a maximum current consumption of 20µA at 5.5V and 800nA in battery mode. It includes two non-volatile alarms, oscillator compensation, and a watchdog timer. The component is housed in an 8-TSSOP package and supports an operating temperature range from -40°C to +85°C.

Real Time Clock Feature Summary

• I2C bus interface supporting up to 400kHz data transfer rate
• Integrated 512x8-bit EEPROM with 16-byte page write capability
• On-chip oscillator compensation with 64-position digitally controlled trim capacitor
• Automatic backup switching between VDD and VBAT power supplies

Real Time Clock Applications

• Utility meters
• HVAC equipment
• Network routers, hubs, switches, and bridges
• POS equipment
• Industrial controls

Real Time Clock Procurement Notes

The ISL12027IVAZ is classified as an obsolete product with no recommended replacement available from the manufacturer. Verification of availability should be conducted through authorized distributors or secondary market suppliers, as standard production channels do not support this part number.

Real Time Clock Selection Notes

Select the ISL12027IVAZ when legacy compatibility with Intersil ISL12027 specifications is required. Ensure the design accommodates the 8-TSSOP package dimensions and utilizes an external 32.768kHz quartz crystal for the oscillator. Verify that the system voltage requirements align with the 2.7V to 5.5V operational range.

Real Time Clock Part Context

This component belongs to the ISL12027 family of real-time clocks produced by Renesas Electronics (formerly Intersil). The IV suffix indicates the 8-lead TSSOP package option. The AZ suffix typically denotes lead-free packaging compliant with RoHS standards. This specific variant represents the standard ISL12027 configuration rather than the ISL12027A variant.

Real Time Clock Replacement Considerations

The datasheet explicitly states there is no recommended replacement for this obsolete product. Engineers must evaluate third-party equivalents or redesign the system architecture to accommodate currently available RTC components.