isl12027 low power real time clock/calendar
The ISL12027 real‑time clock/calendar integrates a 32.768 kHz crystal‑compensated oscillator, calendar registers through 2099, two programmable alarms and a backup battery supply. It includes 512 × 8‑bit EEPROM organized in 16‑byte pages and supports I²C communication up to 400 kHz.
Typical applications include utility meters, HVAC equipment, audio/video components, networking gear, POS devices, and other industrial, medical or automotive products. The device is offered in 8‑lead SOIC and TSSOP packages and meets RoHS requirements.
| Supply Voltage (VDD) | 2.7 V to 5.5 V |
|---|---|
| Backup Supply Voltage (VBAT) | 1.8 V to 5.5 V |
| EEPROM Size | 512 × 8 bits (16‑byte pages) |
| EEPROM Endurance | > 2,000,000 cycles per byte |
| EEPROM Data Retention | 50 years |
| Low‑Power Mode Current | 800 nA |
| I²C Clock Frequency | up to 400 kHz |
The device operates from 2.7 V to 5.5 V on its main power pin.
It contains 512 × 8 bits of EEPROM organized in 16‑byte pages.
The I²C interface can run up to 400 kHz.
The backup current draw is 800 nA.