GENERAL DESCRIPTION

The W83194BR-PT is a Clock Synthesizer for VIA PT chipset. W83194BR-PT provides all clocks required for high-speed microprocessor and provides step-less frequency programming and 32 different frequencies of CPU, PCI, and AGP clocks setting. All clocks are externally selectable with smooth transitions.

PRODUCT FEATURES

• 2 Differential pairs of CPU clock outputs

• 1 Differential pairs push pull of CPU_CS clock outputs

• 3 AGP clock outputs

• 9 PCI synchronous clocks

• 24_48Mhz clock output for super I/O.

• 48 MHz clock output for USB.

• 2 IOAPIC clock outputs.

• 1 REF clock output.

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

• Smooth frequency switch with selections from 100 to 200MHz

• Step-less frequency programming

• I2C 2-Wire serial interface and support byte read/write and block read/write.

• -0.5 and +/- 0.25 center type spread spectrum

• Programmable S.S.T. scale to reduce EMI

• Programmable registers to enable/stop each output and select modes

• Watch Dog Timer and RESET# output pins

• 48-pin SSOP package