DESCRIPTION
The X9523 combines two Digitally Controlled Potentiometers (DCPs), V1 / Vcc Power-on Reset (POR) circuitry, qnd two programmable voltage monitor inputs with software and hardware indicators. All functions of the X9523 are accessed by an industry standard 2-Wire serial interface.
The DCPs of the X9523 may be utilized to control the bias and modulation currents of the laser diode in a Fiber Optic module. The programmable POR circuit may be used to ensure that V1 / Vcc is stable before power is applied to the laser diode / module. The programmable voltage monitors may be used for monitoring various module alarm levels.

FEATURES
• Two Digitally Controlled Potentiometers (DCPs)
   —100 Tap - 10kΩ
   —256 Tap - 100kΩ
   —Nonvolatile
   —Write Protect Function
• 2-Wire industry standard Serial Interface
• 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
   —XBGATM
   —TSSOP