Clock for Intel® Chipsets

The W83194BG-323 is a Clock Synthesizer for Intel Brook dale 845 chipset, which provides all clocks required for high-speed microprocessor and provides step-less frequency programming and 32 different frequencies of CPU, PCI, and 3V66 clocks setting. All clocks are externally selectable with smooth transitions.

W83194BG-323 provides I²C serial bus interface to program the registers to enable or disable each clock outputs and -0.5% and +/-0.25% center type spread spectrum or programmable S.S.T. scale to reduce EMI. It also has watchdog timer and reset output pin to support auto-reset when systems hanging caused by improper frequency setting. W83194BG-323 accepts a 14.318 MHz reference crystal as its input and runs on a 3.3V supply. High drive PCI CLOCK outputs typically provide greater than 1 V /ns slew rate into 30 pF loads. The fixed frequency outputs as REF and 48 MHz provide better than 0.5V /ns slew rate.

• 3 Differential pairs of CPU clock outputs
• 4x 3V66 clock outputs, and 10x PCI synchronous clocks
• 24_48Mhz clock output for super I/O, and 48 MHz clock output for USB.
• Skew form CPU to PCI clock 1 to 4 ns, center 2.6 ns
• Smooth frequency switch with selections from 66.8 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 or 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