I Watchdog is a device that monitors the SDA signal, compatible with a 400kHz I2C bus, operates at a voltage range of 2.7V to 6.0V, utilizes low power CMOS technology, has a 16-byte page write buffer, and built-in inadvertent write protection. It supports active high or low reset, precision power supply voltage monitor for 5V, 3.3V, and 3V systems, and offers five threshold voltage options. It has a program/erase cycle of 1,000,000, manual reset, and 100-year data retention. It is available in 8-pin DIP or 8-pin SOIC packages, and suitable for commercial and industrial temperature ranges.
The CAT1161/2 is a combined 16‑Kbit serial EEPROM, power‑supervisor, reset controller and watchdog timer designed for microcontroller‑based systems. It operates from 2.7 V to 6.0 V, supports both active‑high and active‑low reset outputs, and offers five selectable reset‑threshold voltage ranges.
Key specifications include a 1.6 second watchdog timeout, up to 1 000 000 program/erase cycles, 100‑year data retention, and availability in 8‑pin DIP or 8‑pin SOIC packages. The device conforms to standard I²C bus timing and provides hardware write‑protect features.
| Supply voltage range | 2.7 V to 6.0 V |
|---|---|
| Watchdog timeout | 1.6 s |
| Program/Erase endurance | 1,000,000 cycles |
| Data retention | 100 years |
| Package options | 8‑pin DIP or 8‑pin SOIC |
| Reset threshold voltage (example) | 4.50 V – 4.75 V (CAT1161/2‑45) |
| I²C clock frequency | 100 kHz – 400 kHz |
The watchdog timer times out after 1.6 seconds of no activity on the SDA line.
The device operates from 2.7 V up to 6.0 V.
The EEPROM is rated for up to 1,000,000 program/erase cycles per byte.