ISL1218IUZ

Real Time Clock Overview

The ISL1218IUZ is a Real-Time Clock (RTC) and event recorder manufactured by Renesas Electronics Corporation. It features an I²C serial interface for communication with host processors. The device operates within a supply voltage range of 2.7V to 5.5V and includes a backup power input supporting voltages from 1.8V to 5.5V. It provides timekeeping capabilities in HH:MM:SS format and date tracking in YY-MM-DD-dd format. The component is housed in a 10-MSOP package and is rated for operation temperatures between -40°C and +85°C.

Real Time Clock Feature Summary

• I²C serial interface for low-pin-count connectivity
• Integrated alarm function and leap-year compensation
• Non-volatile SRAM storage for event recording
• Dual power supply support for main and backup sources

Real Time Clock Applications

• Data logging systems requiring timestamping
• Industrial equipment needing precise timekeeping
• Consumer electronics with calendar functions

Real Time Clock Procurement Notes

Verify the specific suffix 'IUZ' corresponds to the MSOP-10 package and commercial temperature grade when sourcing. Confirm RoHS compliance status through official manufacturer documentation or authorized distributor certificates prior to procurement.

Real Time Clock Selection Notes

Select this component when an I²C interface is required for RTC functionality. Ensure the system design accommodates the 2.7V minimum operating voltage for the main supply and the 1.8V minimum for the backup battery input. Verify that the 10-MSOP footprint matches the PCB layout constraints.

Real Time Clock Part Context

This part belongs to the ISL1218/ISL1219 series of real-time clocks. While sharing core timekeeping features, variants in this family may differ in pinout, package type, or specific feature sets such as event recording capacity. Consult the specific datasheet for the ISL1218 to distinguish it from similar models like the ISL1219.

Real Time Clock FAQ

What is the maximum current consumption during active timekeeping?

Current consumption varies based on supply voltage and temperature; refer to the electrical characteristics section of the datasheet for specific values at 3V and 5V.

Does the ISL1218IUZ support century rollover?

The device tracks the year in a two-digit format (YY). Century rollover handling typically requires software intervention by the host microcontroller.

What is the purpose of the VBAT pin?

The VBAT pin connects to a backup battery or capacitor to maintain timekeeping and SRAM data during main power loss.