DESCRIPTION
These devices combine four popular functions, Power-on Reset Control, Watchdog Timer, Supply Voltage Supervision, and Block Lock Protect Serial EEPROM Memory in one package. This combination lowers system cost, reduces board space requirements, and increases reliability.

FEATURES
• Selectable watchdog timer
• Low VCC detection and reset assertion
    —Five standard reset threshold voltages
    —Re-program low VCC reset threshold voltage using special programming sequence
    —Reset signal valid to VCC = 1V
• Determine watchdog or low voltage reset with a volatile flag bit
• Long battery life with low power consumption
    —<50µA max standby current, watchdog on
    —<1µA max standby current, watchdog off
    —<400µA max active current during read
• 64Kbits 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 Block Lock™ protection
    —In circuit programmable ROM mode
• 2MHz SPI interface modes (0,0 & 1,1)
• Minimize EEPROM programming time
    —32-byte page write mode
    —Self-timed write cycle
    —5ms write cycle time (typical)
• 2.7V to 5.5V and 4.5V to 5.5V power supply operation
• Available packages
    —8-lead PDIP, 14-lead SOIC