X5043

4K X5043/X5045 CPU Supervisor with 4K SPI EEPROM 512 x 8 Bit FEATURES Selectable time out 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 Long battery life with low power consumption —<50µA max standby current, watchdog on —<10µA max standby current, watchdog off —<2mA max active current during read 2.7V to 5.5V and 4.5V to 5.5V power supply versions 4Kbits of EEPROM–1M write cycle endurance Save critical data with Block Lock™ memory —Protect 1/4, 1/2, all or none of EEPROM array Built-in inadvertent write protection —Write enable latch —Write protect pin 3.3MHz clock rate Minimize programming time —16-byte page write mode —Self-timed write cycle —5ms write cycle time (typical) SPI modes (0,0 & 1,1) Available packages —8-lead MSOP, 8-lead SOIC, 8-pin PDIP —14-lead TSSOP BLOCK DIAGRAM Watchdog Transition Detector WP SI SO SCK Data Register Command Decode & Control Logic VCC Threshold Reset Logic DESCRIPTION These devices combine four popular functions, Poweron 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. Applying power to the device activates the power on reset circuit which holds RESET/RESET active for a period of time. This al...