PCN20070902

Features:

 Support Both DDR I (1.25VTT) and DDR II
  (0.9VTT) Requirements Capable of Sourcing and Sinking Current Current-limiting Protection Thermal Protection Integrated Power MOSFETs Generates Termination Voltages for SSTL- High Accuracy Output Voltage at Full-Load Adjustable V  by External Resistors
OUT Minimum External Components Shutdown for Standby or Suspend Mode
  Operation with High-impedance Output


Application

 DDRI/DDRII Memory Termination Supply Active Termination Buses Desktop PC,NoTebook,Server and workstation Graphic Card Set Top Box Embedded System


Description

The AT9173 is a voltage regulator which could
convert the input voltage ranging from 1.8V to 5V to an
output voltage that user settled. The regulator AT9173 can
provide sourcing or sinking current.The AT9173, used
in conjunction with series termination resistors,
provides an excellent voltage source for active
termination schemes of high speed transmission lines
as those seen in high speed memory buses and
distributed backplane designs.
The voltage output of the regulator AT9173 can be used as a
termination voltage for DDR SDRAM.
Current limits in both sourcing and sinking mode, plus
on-chip thermal shutdown make the circuit tolerant of
the output fault conditions.