ISL12027IV30AZ-T

Real Time Clock Overview

The ISL12027IV30AZ-T is a low-power real-time clock and calendar integrated circuit manufactured by Renesas Electronics. It features an I²C interface, 512-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. It maintains timekeeping current between 10µA and 20µA depending on the supply voltage. The component is housed in an 8-lead TSSOP package and supports an operating temperature range from -40°C to +85°C.

Real Time Clock Feature Summary

• I²C Bus Interface: Supports data transfer rates up to 400kHz for serial communication.
• On-Chip Oscillator Compensation: Includes internal feedback resistors, compensation capacitors, and a 64-position digitally controlled trim capacitor for frequency adjustment within ±30ppm.
• Integrated Memory: Contains 512x8-bit EEPROM with 16-byte page write mode and BlockLock protection.
• CPU Supervisor Functions: Features power-on reset, low-voltage sensing, and a watchdog timer.

Real Time Clock Applications

• Utility Meters
• HVAC Equipment
• Network Routers, Hubs, Switches, Bridges
• Cellular Infrastructure Equipment
• POS Equipment

Real Time Clock Procurement Notes

Verify that the ordering suffix '-T' corresponds to tape and reel packaging as specified in the datasheet notes. Confirm the VRESET voltage level associated with the '30' suffix (3.09V typical) matches the system requirements. Check manufacturer documentation for current product status, as this series may be obsolete.

Real Time Clock Selection Notes

Select the ISL12027 variant based on the required Low Voltage Reset threshold; the '30' suffix indicates a typical VRESET of 3.09V. Ensure the application utilizes an external 32.768kHz quartz crystal connected to X1 and X2 pins. Verify that the battery backup voltage remains above 1.8V to guarantee correct operation during power loss events.

Real Time Clock Part Context

This component belongs to the ISL12027 family of real-time clocks. The specific part number denotes the 8-lead TSSOP package option with a 3.09V reset threshold. The '-T' suffix indicates the unit is supplied in tape and reel format for automated assembly processes.

Real Time Clock Replacement Considerations

The datasheet identifies this product as obsolete with no recommended replacement provided by the manufacturer. Contact technical support for potential alternatives or design modifications.