GENERAL DESCRIPTION

The W83194BR-97 is a Clock Synthesizer for Intel Camino 820 chipset. W83194BR-97 provides all clocks required for high-speed RISC or CISC microprocessor and also provides 64 sets of different frequencies of CPU, PCI, 3V66, IOAPIC clocks or stepless frequecies programming by M/N value via I2C registers. All clocks are externally selectable with smooth transitions.

PRODUCT FEATURES

• 2 CPU clock outputs

• One CPU/2 output as reference input to DRCG

• 3 3V66 clock outputs

• 3 IOAPIC clock outputs

• 8 PCI synchronous clocks.

• Optional single or mixed supply: (VddQ2 = VddQ3 = 3.3V or VddQ3=3.3V, VddQ2=2.5V)

• CPU to 3V66 offset 0 to 1.5 ns

• 3V66 to PCI offset 1.5 to 4.0 ns

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

• Smooth frequency switch with selections from 66.8 to 200MHz

• Stepless programmable frequencies by I2C register9 ~ register12

• I2C 2-Wire serial interface and I2C read back

• 0.5 and 0.75 center type spread spectrum

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

• 48 MHz pins for USB

• 24 MHz for super I/O

• 48-pin SSOP package