CAT1161/2 is a complete memory and supervisory solution for microcontroller-based systems. A 16K serial EEPROM memory with hardware memory write protection, a system power supervisor with brown out protection and a watchdog timer are integrated together in low power CMOS technology. Memory interface is via an I2C bus. The 1.6-second watchdog circuit returns a system to a known good state if a software or hardware glitch halts or “hangs” the system. The CAT1161 watchdog monitors the SDA line, making an additional PC board trace unnecessary. The lower cost CAT1162 does not have a watchdog timer. The power supply monitor and reset circuit protects memory and system controllers during power up/down and against brownout conditions. Five reset threshold voltages support 5V, 3.3V and 3V systems. If power supply voltage drops below the threshold, the system will reset.
The Catalyst CAT1161/2 is a complete memory and supervisory solution designed for microcontroller-based systems. It integrates a 16-Kbit serial EEPROM with hardware write protection, a precision power supply supervisor with brown-out detection, and an optional watchdog timer (present only in the CAT1161 variant). The device operates on a standard I2C bus.
| Memory Size | 16-Kbit (16-Byte page write buffer) |
|---|---|
| Operating Voltage Range | 2.7V to 6.0V |
| Clock Frequency | 100 kHz to 400 kHz |
| Program/Erase Cycles | 1,000,000 cycles/byte |
| Data Retention | 100 Years |
| Watchdog Timer Period | 1.6 seconds |
| Reset Timeout | 200 ms typical |
The CAT1161 includes a watchdog timer that monitors the SDA line, while the lower cost CAT1162 does not have a watchdog timer.
Five options are available: 4.50-4.75V, 4.25-4.50V, 3.00-3.15V, 2.85-3.00V, and 2.55-2.70V.
The device is available in an 8-pin DIP or an 8-pin SOIC surface mount package.