ISL12028AIV27Z

Real Time Clock Overview

The ISL12028AIV27Z is a low-power real-time clock/calendar integrated circuit manufactured by Renesas Electronics. It features an I2C interface, two non-volatile alarms, and 512x8-bit EEPROM with BlockLock protection. The device operates on a main supply of 2.7V to 5.5V and a backup supply of 1.8V to 5.5V, consuming 800nA in battery mode. It includes CPU supervisor functions such as Power-On Reset and Watchdog Timer. The component is housed in a 14-lead TSSOP package and supports an operating temperature range from -40°C to +85°C.

Real Time Clock Feature Summary

• Integrated 512x8-bit EEPROM with 8 modes of BlockLock protection and 50-year data retention
• Two non-volatile alarms settable to the second, minute, hour, day, or month
• On-chip oscillator compensation with 64-position digitally controlled trim capacitor
• CPU Supervisor functions including Power-On Reset and Watchdog Timer

Real Time Clock Applications

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

Real Time Clock Procurement Notes

The ISL12028AIV27Z is classified as an obsolete product with no recommended replacement available. Verification of current availability should be conducted directly through Renesas Technical Support or authorized distributors, as standard inventory channels may not stock this discontinued part number.

Real Time Clock Selection Notes

Select the ISL12028A variant specifically when VBAT exceeds VDD, as it utilizes Standard Mode power control settings unlike the Legacy Mode of the ISL12028. Ensure the design accommodates the 14-lead TSSOP package dimensions and provides an external 32.768kHz quartz crystal for the oscillator input.

Real Time Clock Part Context

This component belongs to the ISL12028 family of real-time clocks. The 'A' suffix denotes the Standard Mode power control setting, while 'IV' indicates the 14-lead TSSOP package. The '27' suffix specifies a VRESET threshold of 2.63V and a BSW default setting of 1. The device integrates EEPROM and CPU supervision features distinct from basic RTC models.

Real Time Clock Replacement Considerations

No recommended replacement is officially listed for this obsolete product. Users are advised to contact the manufacturer's Technical Support Center for guidance on potential alternatives or legacy support options.