GENERAL DESCRIPTION

The W83195BR-25 is a Clock Synthesizer for Intel 815 Solano chipset. W83195BR-25 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 (2.5V)

• 3 3V-66 clocks (3.3V)

• 12 SDRAM clocks for 3 DIMMs(3.3V)

• 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 center and 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 56-pin SSOP