ISL12026IBZ-T

Real Time Clock Overview

The ISL12026IBZ-T is a micro-power real-time clock (RTC) and calendar IC manufactured by Renesas Electronics Corporation. It features an I2C bus interface, operating within a supply voltage range of 2.7V to 5.5V and a battery backup range of 1.8V to 5.5V. The device tracks time in hours, minutes, and seconds, with calendar accuracy through 2099 including automatic leap year correction. It integrates 512x8 bits of EEPROM and draws a maximum current of 10µA to 20µA at 2.7V–5.5V. Packaged in an 8-SOIC format, it supports operation from -40°C to +85°C.

Real Time Clock Feature Summary

• Integrated 512x8-bit EEPROM with 16-byte page write mode and block lock protection
• Automatic backup switching between main power and battery/supercapacitor sources
• Two non-volatile alarms with repeat mode for periodic interrupts
• On-chip oscillator compensation with 64-position digital trim capacitors

Real Time Clock Applications

• Utility meters
• HVAC equipment
• Automatic backup systems

Real Time Clock Procurement Notes

The ISL12026IBZ-T is listed as a discontinued product by the manufacturer. Verification of availability should focus on remaining stock from authorized distributors or secondary market suppliers. Designers must confirm the specific manufacturing lot date and ensure compatibility with existing board layouts before procurement, as end-of-life status may limit long-term supply continuity.

Real Time Clock Selection Notes

Select this component when a low-power RTC with integrated non-volatile memory is required for space-constrained applications. The 8-SOIC package suits surface-mount designs. Verify that the system design accommodates the 32.768kHz external crystal requirement. Consider the ISL12026A series if standard mode power control settings are preferred over the legacy mode used by this part.

Real Time Clock Part Context

This part belongs to the ISL12026 family of real-time clocks. It utilizes the legacy power control setting, distinguishing it from the ISL12026A variant which uses standard mode settings. The 'IBZ' suffix indicates the 8-SOIC package option, while '-T' denotes tape and reel packaging. It shares functional similarities with other Intersil-derived RTCs but offers specific EEPROM integration.

Real Time Clock Replacement Considerations

Direct pin-to-pin replacements may be limited due to the discontinuation status. The ISL12026AIVZ-T is a related variant with different power control settings but similar functionality. Engineers should review the datasheet differences regarding power management registers before substituting.