ISL12058IRTZ-T

Real Time Clock Overview

The ISL12058IRTZ-T is a low-power I2C bus real-time clock/calendar manufactured by Renesas Electronics. It tracks time in hours, minutes, and seconds and includes calendar registers for date, month, year, and day of the week, with automatic leap year correction accurate through 2099. The device operates within a supply voltage range of 1.4V to 3.6V and supports an I2C interface with a data transfer rate of 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 consumes 0.5µA during timekeeping and utilizes an external 32.768kHz crystal.

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.
• Frequency Outputs: Four selectable frequency output pins for system synchronization.
• Low Power Consumption: Timekeeping current of 0.5µA; no battery backup switching mechanism.

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 package type matches the required footprint, as the ISL12058 series is available in MSOP, SOIC, TDFN, and µTDFN packages. Confirm the suffix 'IRTZ-T' corresponds to the specific reel packaging and temperature grade intended for the design. Ensure the external 32.768kHz crystal selection aligns with the load capacitance requirements specified in the datasheet for optimal accuracy.

Real Time Clock Selection Notes

Select this component when a low-cost, low-power RTC with dual alarms and multiple frequency outputs is required. It serves as a 3V alternative to the ISL1208 and ISL12082 models but lacks the battery-backed SRAM and automatic backup switching found in those variants. Suitable for applications where battery retention is not critical or managed externally.

Real Time Clock Part Context

The ISL12058 is part of the Renesas ISL12058 series of real-time clocks. It shares functional similarities with the ISL1208 but is optimized for lower voltage operation (1.4V min) and omits the battery backup switch and user SRAM. The 'IRTZ-T' designation indicates the specific tape and reel packaging variant of this device.

Real Time Clock Replacement Considerations

The ISL1208 and ISL12082 are functional alternatives but operate at higher voltages (2.7V min) and include battery backup switching and SRAM. Direct pin-compatible replacements may require verification of voltage levels and feature differences. No other public substitute part numbers are confirmed in the provided documentation.