CAT1163

CAT1163 (16K) Supervisory Circuit with I2C Serial CMOS EEPROM, Precision Reset Controller and Watchdog Timer FEATURES s Watchdog timer input (WDI) s 400kHz I2C bus compatible s 2.7V to 6.0V operation s Low power CMOS technology s 16-Byte page write buffer s Built-in inadvertent write protection s Active high or low reset — Precision power supply voltage monitor — 5V, 3.3V and 3V systems — Five threshold voltage options s 1,000,000 Program/Erase cycles s Manual reset s 100 Year data retention s 8-pin DIP or 8-pin SOIC s Commercial and industrial temperature ranges — VCC lock out — Write protect pin, WP DESCRIPTION The CAT1163 is a complete memory and supervisory solution for microcontroller-based systems. A serial EEPROM memory (16K) 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 CAT1163 watchdog monitors the WDI input pin. 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 voltages are out of tolerance reset signals become active, preventing the system microcontroller, ASIC or peripherals from operating. Reset signals beco...