ISL12082IUZ

Real Time Clock Overview

The ISL12082IUZ is a low-power I²C serial real-time clock/calendar with battery-backed SRAM. It tracks time in hours, minutes, and seconds, and includes calendar registers for day of the week, date, month, and year, accurate through 2099 with automatic leap-year correction. The device features two alarms settable to second, minute, hour, day of week, date, or month, and four selectable frequency outputs. It operates on a 2.7V to 5.5V supply with a 400nA battery backup current. The component uses an external 32.768kHz crystal and provides intelligent battery backup switching.

Real Time Clock Feature Summary

• I²C interface with 400kHz data transfer rate
• Two programmable alarms and four selectable frequency outputs
• Automatic leap-year correction through 2099
• Intelligent battery backup switching with power failure detection

Real Time Clock Applications

• Utility meters
• HVAC equipment
• Set-top boxes and televisions
• Network routers and switches
• Point-of-sale equipment

Real Time Clock Procurement Notes

Verify the specific suffix 'IUZ' corresponds to the MSOP-8 package and RoHS compliance status in the official datasheet. Confirm availability as distribution status varies by region and lot. Check for any product change notices (PCN) regarding assembly sites or material updates before finalizing procurement.

Real Time Clock Selection Notes

Select this part when dual alarm functionality and frequency outputs are required alongside standard RTC capabilities. Ensure the system design accommodates the 2.7V to 5.5V VCC range and provides space for an external 32.768kHz crystal. Compare against ISL1208 if only single alarm is needed, or ISL12058 if lower voltage operation is sufficient.

Real Time Clock Part Context

The ISL12082 is part of the Renesas ISL1208 family of low-power real-time clocks. It shares pinout compatibility with ST M41Txx and Maxim DS13xx devices, facilitating drop-in replacements in existing designs. It offers enhanced features over basic RTCs, including battery-backed SRAM and multiple interrupt modes.

Real Time Clock Replacement Considerations

Direct pin-compatible alternatives include the ISL1208 (single alarm) and ISL12082 variants with different package suffixes. Verify that substitute parts support the same I²C address configuration and alarm logic if migrating from other manufacturers like ST or Maxim.