GENERAL DESCRIPTION

The W83194BR-903 is a Clock Synthesizer for VIA PT880/PM880 chipset. W83194BR-903 provides all clocks required for high-speed microprocessorand provides step-less frequency programming and 32 different frequencies of CPU, PCI, and AGP clocks setting, support two 25MHz clock outputs, all clocks are externally selectable with smooth transitions.

PRODUCT FEATURES

• 3 0.7V current-mode Differential pairs clock outputs

• 2 2.5V 25MHz clock outputs

• 3 AGP clock outputs

• 10 PCI synchronous clocks

• 1 24_48Mhz clock output for super I/O.

• 1 48 MHz clock output for USB.

• 2 14.318MHz REF clock outputs.

• AGP/PCI clock out supports synchronous and asynchronous mode

• Smooth frequency switch with selections from 100 to 400MHz

• 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

• Programmable clock outputs Slew rate control and Skew control

• Watch Dog Timer and RESET# output pins

• 48-pin SSOP package