ISL12058IRUZ-T

Real Time Clock Overview

The ISL12058IRUZ-T is a low-power I2C bus real-time clock/calendar manufactured by Renesas Electronics. It tracks time in hours, minutes, and seconds using separate registers and includes calendar registers for date, month, year, and day of the week, with automatic leap year correction accurate through 2099. The device operates on a supply voltage range of 1.4V to 3.6V and supports an I2C interface with a data transfer rate up to 400kHz. It features two alarms settable to the second, minute, hour, day of the week, date, or month, and provides four selectable frequency outputs. The component is housed in an 8-lead µTDFN package (2mm x 2mm) and consumes 0.5µA during timekeeping.

Real Time Clock Feature Summary

• I2C Interface: Supports 400kHz data transfer rate for efficient communication.
• Dual Alarms: Two programmable alarms configurable to second, minute, hour, day of week, date, or month.
• Calendar Functionality: Tracks date, month, year, and day of the week with automatic leap year correction through 2099.
• Low Power Consumption: Timekeeping current is 0.5µA; operates within 1.4V to 3.6V supply voltage.

Real Time Clock Applications

• Utility Meters
• HVAC Equipment
• Set-Top Box/Television
• Network Routers, Hubs, Switches, Bridges
• Point Of Sale Equipment

Real Time Clock Procurement Notes

Verify the manufacturer designation as Renesas Electronics, as Elantec was acquired by Intersil which later became part of Renesas. Confirm the suffix 'T' indicates tape-and-reel packaging if required for automated assembly. Ensure the specific µTDFN package variant matches the design footprint requirements.

Real Time Clock Selection Notes

Select this component when a low-cost, low-power RTC with dual alarms and I2C interface is needed. It serves as a 3V alternative to the ISL1208 and ISL12082 models but lacks battery-backed SRAM and automatic backup switching found in those variants. Verify that the 1.4V minimum operating voltage aligns with the system's power rail capabilities.

Real Time Clock Part Context

The ISL12058 belongs to the ISL12058 series of real-time clocks. It is functionally similar to the ISL1208 but simplifies the feature set by removing battery-backed SRAM and CPU supervisory functions. The IRUZ suffix denotes the 8-lead µTDFN package type, distinguishing it from MSOP, SOIC, or TDFN package options available in the same family.

Real Time Clock Replacement Considerations

The ISL1208 and ISL12082 are related parts offering additional features like battery-backed SRAM and automatic backup switching. Direct pin-compatible replacements may include other I2C RTCs from Renesas or competitors, provided they support the 1.4V-3.6V range and 400kHz I2C speed. Verify package dimensions for the µTDFN form factor when substituting.