ISL1218IBZ

Real Time Clock Overview

The ISL1218IBZ is a low-power, I2C-compatible real-time clock (RTC) and battery-backed SRAM device manufactured by Renesas Electronics. It integrates a precision RTC with an alarm function and 56 bytes of non-volatile RAM. The device operates from a single supply voltage ranging from 2.3V to 3.6V or 4.5V to 5.5V, depending on the specific variant configuration. It features a built-in lithium battery backup input to maintain timekeeping and data retention during main power loss. The component utilizes a standard two-wire serial interface for communication, ensuring compatibility with various microcontrollers and system-on-chip platforms requiring precise time synchronization.

Real Time Clock Feature Summary

• I2C-compatible serial interface supporting standard and fast mode operations
• Integrated 56-byte battery-backed static RAM for data storage
• Programmable square wave output and alarm interrupt capabilities
• Low current consumption in both active and standby modes

Real Time Clock Applications

• Portable consumer electronics requiring accurate timekeeping
• Industrial control systems needing non-volatile data logging
• Telecommunications equipment with power failure data preservation
• Automotive infotainment systems requiring synchronized timestamps

Real Time Clock Procurement Notes

Verify the specific suffix codes against official Renesas documentation to confirm voltage range and package type. Ensure the ordering part number matches the required operating temperature grade and pin configuration. Cross-reference the datasheet revision date to confirm feature availability and electrical characteristics before procurement.

Real Time Clock Selection Notes

Select this component when an I2C interface is preferred over SPI for RTC functionality. Confirm that the system design supports the required I2C pull-up resistors and address configuration. Evaluate the battery backup circuit requirements to ensure adequate capacity for the specified standby duration and temperature range.

Real Time Clock Part Context

This part belongs to the ISL121x family of real-time clocks. It serves as a drop-in replacement for older RTC solutions requiring I2C connectivity. The IBZ suffix typically denotes a specific package type and lead-free compliance status within Renesas's product lineup.

Real Time Clock Replacement Considerations

Check for direct pin-to-pin compatible alternatives from Renesas or other manufacturers offering similar I2C RTCs with comparable SRAM sizes. Verify register map compatibility if migrating existing firmware to a substitute part.