GENERAL DESCRIPTION

The W83194BR-KT is a Clock Synthesizer which provides all clocks required for AMD K7. W83194BR-KT provides 64 CPU/PCI frequencies which are selectable with smooth transitions by hardware or software. W83194BR-KT also provides 13 SDRAM clocks controlled by the none-delay buffer_in pin.

PRODUCT FEATURES

• Supports AMD CPU with I2C.

• 3 CPU clocks (one free-running chipset clock controlled by I2C)

• 13 SDRAM clocks for 3 DIMMs

• 6 PCI synchronous clocks

• Optional single or mixed supply: (Vddq2 =2.5V, Vddq3 =3.3V)

• < 250ps skew among CPU and SDRAM clocks

• < 250ps skew among PCI clocks

• < 5ns 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 66 MHz to 200 MHz CPU

• Step-less frequency programming by controlling the VCO freq. and the clock output divisor ratio

• I2C 2-Wire serial interface and I2C read back

• ±0.25 or ±0.5 spread spectrum function to reduce EMI

• Programmable spread spectrum in the M/N step-less mode

• Programmable registers to enable/stop each output and select modes

• MODE pin for power Management and RESET# out when Watch Dog Timer time out

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

• 48-pin SSOP package