GENERAL DESCRIPTION

The W83194AR-73 is a Clock Synthesizer for Intel Whitney chipset. W83194AR-73 provides all clocks required for high-speed RISC or CISC microprocessor and also provides 32 different frequencies of CPU, SDRAM, PCI, 3V66, IOAPIC clocks frequency setting. All clocks are externally selectable with smooth transitions.

PRODUCT FEATURES

● 2 CPU 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 150MHz

● I2C 2-Wire serial interface and I2C read back

● 0.25 center and 0-0.5 down 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