X4283

® X4283, X4285 128K, 16K x 8 Bit Data Sheet May 23, 2006 FN8121.1 CPU Supervisor with 128K EEPROM FEATURES Selectable watchdog timer Low VCC detection and reset assertion —Four standard reset threshold voltages —Adjust low VCC reset threshold voltage using special programming sequence —Reset signal valid to VCC = 1V Low power CMOS —<20µA max standby current, watchdog on —<1µA standby current, watchdog OFF —3mA active current 128Kbits of EEPROM —64 byte page write mode —Self-timed write cycle —5ms write cycle time (typical) Built-in inadvertent write protection —Power-up/power-down protection circuitry —Protect 0, 1/4, 1/2, all or 64, 128, 256 or 512 bytes of EEPROM array with programmable Block Lock™ protection 400kHz 2-wire interface www.DataSheet4U.com 2.7V to 5.5V power supply operation Available packages —8 Ld SOIC —8 Ld TSSOP Pb-free plus anneal available (RoHS compliant) BLOCK DIAGRAM Watchdog Transition Detector WP SDA Data Register Command Decode & Control Logic VCC Threshold Reset logic Block Lock Control Protect Logic Status Register EEPROM Array DESCRIPTION The X4283, X4285 combines 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. Applying power to the device activates the power-on reset circuit which holds RESET/RESET active for a period of time....