ISL12027IBZ

Real Time Clock Overview

The ISL12027IBZ is a low-power Real Time Clock/Calendar with integrated 512x8-bit EEPROM, manufactured by Renesas Electronics. It features an I2C interface operating at up to 400kHz and supports power supply voltages from 2.7V to 5.5V. The device includes automatic leap year correction through 2099, two non-volatile alarms, and intelligent battery backup switching. It operates within a temperature range of -40°C to +85°C and is housed in an 8-lead SOIC package.

Real Time Clock Feature Summary

• Integrated 512x8-bit EEPROM with 16-byte page write mode and BlockLock protection
• Automatic backup switching between VDD and VBAT with selectable trip points
• On-chip oscillator compensation with 64-position digital trim for frequency adjustment
• Two non-volatile alarms with periodic interrupt capability

Real Time Clock Applications

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

Real Time Clock Procurement Notes

The ISL12027IBZ is classified as an obsolete product with no recommended replacement available from the manufacturer. Verification of current availability requires direct contact with technical support or authorized distributors, as standard supply channels may not stock this discontinued item.

Real Time Clock Selection Notes

Select the ISL12027IBZ when an 8-lead SOIC package is required with a VRESET voltage level of 4.38V. Ensure the application utilizes Legacy Mode settings, as distinct from the ISL12027A Standard Mode. Verify that the system design accommodates the specific battery backup switching behavior defined for this variant.

Real Time Clock Part Context

This component belongs to the ISL12027 family of real-time clocks produced by Intersil, now part of Renesas Electronics. The 'IB' suffix denotes the 8-lead SOIC package option, while '27' indicates the internal VRESET threshold setting. The device integrates CPU supervisory functions including a watchdog timer and power-on reset.

Real Time Clock Replacement Considerations

No recommended replacement is provided by the manufacturer. Designers must evaluate alternative RTCs with similar I2C interfaces and EEPROM integration, ensuring compatibility with the 8-lead SOIC footprint and electrical specifications.