ISL12028IBZ

Real Time Clock Overview

The ISL12028IBZ is a low-power Real Time Clock/Calendar manufactured by Renesas Electronics, housed in a 14-lead SOIC package. It features an I2C bus interface with a maximum data transfer rate of 400kHz and operates within a supply voltage range of 2.7V to 5.5V on VDD, and 1.8V to 5.5V on VBAT. The device includes 512x8-bit EEPROM with block lock protection, two non-volatile alarms, and CPU supervisor functions including Power-On Reset and Watchdog Timer. It utilizes an external 32.768kHz crystal and provides automatic leap year correction through 2099.

Real Time Clock Feature Summary

• Integrated 512x8-bit EEPROM with 8 modes of BlockLock protection and >2,000,000 cycle endurance.
• Dual non-volatile alarms settable on second, minute, hour, day, or month with periodic interrupt capability.
• On-chip oscillator compensation with 64-position digitally controlled trim capacitors for frequency adjustment.
• CPU Supervisor functions including Power-On Reset, Low Voltage Sense, and Watchdog Timer (0.25s, 0.75s, 1.75s).

Real Time Clock Applications

• Utility Meters
• HVAC Equipment
• Network Routers, Hubs, Switches, Bridges

Real Time Clock Procurement Notes

Verify the specific ordering suffix 'IBZ' corresponds to the 14-lead SOIC package with a VRESET threshold of 4.38V and Legacy Mode power control settings. Confirm that the component meets RoHS compliance standards as indicated by the Pb-free designation. Check current availability status as this part may be subject to limited supply or discontinuation notices from the manufacturer.

Real Time Clock Selection Notes

Select the ISL12028IBZ when a 14-lead SOIC package is required instead of the TSSOP variant. Ensure the application design accommodates a VDD supply greater than VBAT, as this model uses Legacy Mode battery switching settings distinct from the ISL12028A series. Verify that the system requires the specific 4.38V reset threshold provided by this suffix.

Real Time Clock Part Context

This component belongs to the ISL12028 family of real-time clocks produced by Renesas (formerly Intersil). It shares core functionality with the ISL12028IVZ but differs in package type (SOIC vs. TSSOP) and physical dimensions. The 'IBZ' suffix specifically denotes the SOIC-14 form factor with standard commercial temperature range operation.

Real Time Clock Replacement Considerations

The datasheet explicitly marks this product as obsolete with no recommended replacement. Contact Technical Support for potential alternatives.