GENERAL DESCRIPTION

The W83194BR-372 is a Clock Synthesizer for SIS 746/748 chipset. W83194BR-372 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, support two ZCLK clock outputs; all clocks are externally selectable with smooth transitions.

PRODUCT FEATURES

• 1 2.5V open drain Differential pairs clock outputs for CPU

• 1 2.5V open drain singled-ended clock output for chipset host bus.

• 2 3.3V ZCLK clock outputs

• 2 AGP clock outputs

• 8 PCI synchronous clocks

• 2 2.5V IOAPIC clock outputs

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

• 1 48 MHz clock output for USB.

• 3 14.318MHz REF clock outputs.

• ZCLK/AGP/PCI clock out supports synchronous and asynchronous mode

• 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

• Programmable clock outputs Skew control

• 48-pin SSOP package