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
●• 32Kbits 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
● —14 Ld TSSOP, 8 Ld SOIC, 8 Ld PDIP
●• Pb-free plus anneal available (RoHS compliant)