GENERAL DESCRIPTION
The W83194R-81 is a Clock Synthesizer for SiS chipset. W83194R-81 provides all clocks required for high-speed RISC or CISC microprocessor such as AMD,Cyrix,Intel Pentium and also provides 16 different frequencies of CPU clocks frequency setting. All clocks are externally selectable with smooth transitions. The W83194R-81 makes SDRAM in synchronous or asynchronous frequency with CPU clocks.

PRODUCT FEATURES
•  Supports PentiumÔ, PentiumÔ Pro, AMD and Cyrix CPUs with I2C.
•  3 CPU clocks
•  13 SDRAM clocks for 3 DIMMs
•  6 PCI synchronous clocks.
•  Optional single or mixed supply:
    (Vdd = Vddq4=Vddq3 = Vddq2b = 3.3V, Vddq2=2.5V) or
    (Vdd = Vddq4=Vddq3 = 3.3V, Vddq2=Vdq2b = 2.5V)
•  Skew form CPU to PCI clock -1 to 4 ns, center 2.6 ns
•  SDRAM frequency synchronous or asynchronous to CPU clocks
•  Smooth frequency switch with selections from 66 to 133mhz(including 90MHz)
•  I2C 2-Wire serial interface and I2C read back
•  0.25%, 0.5% center type spread spectrum to reduce EMI
•  Programmable registers to enable/stop each output and select modes
    (mode as Tri-state or Normal )
•  MODE pin for power Management
•  48 MHz for USB
•  24 MHz for super I/O
•  48-pin SSOP package