GENERAL DESCRIPTION

The W83194R-67A is a Clock Synthesizer which provides all clocks required for high-speed RISC or CISC microprocessor such as Intel Pentium , AMD and Cyrix. W83194R-67A provides sixteen CPU/PCI frequencies which are externally selectable with smooth transitions. W83194R-67AA also provides 13 SDRAM clocks controlled by the none-delay buffer_in pin.

PRODUCT FEATURES

• Supports PentiumÔ , AMD, Cyrix CPU with I2C.

• 4 CPU clocks (one free-running CPU clock)

• 13 SDRAM clocks for 3 DIMs

• 6 PCI synchronous clocks

• Optional single or mixed supply:

(Vddq1=Vddq2 = Vddq3 = Vddq4 = VddL1 =VddL2= 3.3V) or (Vddq1= Vddq2 = Vddq3=Vddq4 = 3.3V, VddL1 = VdqL2 = 2.5V)

• < 250ps skew among CPU and SDRAM clocks

• < 4ns propagation delay SDRAM from buffer input

• Skew from CPU(earlier) to PCI clock -1 to 4ns, center 2.6ns.

• Smooth frequency switch with selections from 60 MHz to 124 MHz CPU

• I2C 2-Wire serial interface and I2C read back

• ¡Ó0.25 or ¡Ó0.5 spread spectrum function to reduce EMI

• Programmable registers to enable/stop each output and select modes (mode as Tri-state or Normal )

• 2ms power up clock stable time

• MODE pin for power Management

• One 48 MHz for USB & one 24 MHz for super I/O

• 48-pin SSOP package