FEATURES

• Dual voltage monitoring

• Active low reset outputs

• Two standard reset threshold voltages

—Factory programmable threshold

• Lowline Output — zero delayed POR

• Reset signal valid to VCC = 1V

• System battery switch-over circuitry

• Selectable watchdog timer

—(0.15s, 0.4s, 0.8s, off)

• 256Kbits of EEPROM

• Built-in inadvertent write protection

—Power-up/power-down protection circuitry

—Protect 0, 1/4, 1/2 or all of EEPROM array with

programmable Block Lock™ protection

—In circuit programmable ROM mode

• Minimize EEPROM programming time

—64 byte page write mode

—Self-timed write cycle

—5ms write cycle time (typical)

• 400kHz 2-wire Interface

• 2.7V to 5.5V power supply operation

• Available package — 20-lead TSSOP