The ISL12026 device is a micro power real time clock with timing and crystal compensation, clock/calender, power-fail indicator, two periodic or polled alarms, intelligent battery backup switching, and integrated 512 x 8 bit EEPROM configured in 16 Byte per page. The oscillator uses an external, low-cost 32.768kHz crystal. The real time clock tracks time with separate registers for hours, minutes, and seconds. The device has calendar registers for date, month, year and day of the week. The calendar is accurate through 2099, with automatic leap year correction.
The ISL12026 is a low‑power real‑time clock/calendar with an integrated 512 × 8‑bit EEPROM. It offers two non‑volatile alarms, three selectable frequency outputs, automatic battery or super‑capacitor backup, and on‑chip oscillator compensation for a 32.768 kHz crystal.
Designed for utility meters, HVAC, audio/video, set‑top boxes, networking equipment and other industrial/medical/automotive applications, the device operates from 2.7 V to 5.5 V (standby down to 1.8 V) and retains data for up to 50 years with >2 million write cycles.
| Supply Voltage (Vpp) | 2.7 V to 5.5 V |
|---|---|
| Backup Voltage (Veat) | 1.8 V to 5.5 V |
| EEPROM Size | 512 × 8 bits |
| Data Retention | 50 years |
| EEPROM Endurance | >2 000 000 write cycles |
| Frequency Outputs | 1 Hz, 4 kHz, 32.768 kHz |
| I²C Bus Speed | 400 kHz |
| Operating Temperature Range | -40 °C to +85 °C |
The device provides a backup supply pin (Veat) that can be connected to a battery or a super‑capacitor.
It includes two non‑volatile alarms that can be set on seconds, minutes, hours, day, date or month.
The device is rated for a supply voltage up to 5.5 V.
The I²C interface operates up to 400 kHz.