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.

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
• 2.7V to 5.5V power supply operation
• Available packages
   —8 Ld SOIC
   —8 Ld TSSOP
• Pb-free plus anneal available (RoHS compliant)