GENERAL DESCRIPTION

The W83194BR-138 is a Clock Synthesizer for Intel 815 Solano chipset. W83194BR-138 provides all clocks required for high-speed RISC or CISC microprocessor and also provides 64 different frequencies of CPU, SDRAM, PCI, 3V66, IOAPIC clocks frequency setting. All clocks are externally selectable with smooth transitions.

PRODUCT FEATURES

• 2 CPU clocks

• 3 3V66 clocks

• 9 SDRAM clocks for 2 DIMMs

• 8 PCI synchronous clocks.

• Optional single or mixed supply: (VDDR = VDDP=VDDS = VDD48 = VDD3 = 3.3V, VDDA=VDDC=2.5V)

• Skew form CPU to PCI clock -1 to 4 ns, center 2.6 ns

• Smooth frequency switch with selections from 66.8 to 200MHz

• I2C 2-Wire serial interface and I2C read back

• 0.25 or 0.5 center type spread spectrum

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

• 48 MHz for USB

• 24 MHz for super I/O

• Packaged in 48-pin SSOP