W83194BR-K8

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