X5323

® X5323, X5325 (Replaces X25323, X25325) Data Sheet October 27, 2005 FN8131.1 CPU Supervisor with 32Kb SPI EEPROM 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) BLOCK DIAGRAM Watchdog Transition Detector WP SI SO SCK CS/WDI Data Register Command Decode & Control Logic VCC Threshold Reset Logic Protect Logic 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 requirem...