DESCRIPTION
   The X9520 combines three Digitally Controlled Potentiometers (DCPs), V1 / Vcc Power-on Reset (POR) circuitry, two programmable voltage monitor inputs with software and hardware indicators, and integrated EEPROM with Block Lock™ protection. All functions of the X9520 are accessed by an industry standard 2-Wire serial interface.

FEATURES
• Three Digitally Controlled Potentiometers (DCPs)
   —64 Tap - 10kΩ
   —100 Tap - 10kΩ
   —256 Tap - 100kΩ
   —Nonvolatile
   —Write Protect Function
• 2kbit EEPROM Memory with Write Protect & Block
   LockTM
• 2-Wire industry standard Serial Interface
   —Complies to the Gigabit Interface Converter
   (GBIC) specification
• Power-on Reset (POR) Circuitry
   —Programmable Threshold Voltage
   —Software Selectable reset timeout
   —Manual Reset
• Two Supplementary Voltage Monitors
   —Programmable Threshold Voltages
• Single Supply Operation
   —2.7V to 5.5V
• Hot Pluggable
• 20 Pin packages
   —CSP (Chip Scale Package)
   —TSSOP