Clock for Intel® Chipsets

W83194BG-SD is a Clock Synthesizer for Intel P4 Springdale series chipset, which provides all clocks required for high-speed microprocessor and step-less frequency programming and 32 different frequencies of CPU, SRC, PCI, and 3V66 clocks setting. All clocks are externally selectable with smooth transitions.

W83194BG-SD support I²C serial bus interface to program the registers to enable or disable each clock outputs and provides +/-0.25%, +/-0.5% center type and –0.5%, -1.0% down type spread spectrum or programmable S.S.T. scale to reduce EMI. W83194BG-SD also has watchdog timer and reset output pin to support auto-reset when systems hanging caused by improper frequency setting. It accepts a 14.318 MHz reference crystal as its input and runs on a 3.3V supply.

• 2 pairs current mode differential clock for CPU and Chipset, 1 pair current mode differential clock for SRC
• 3x 3V66 clock outputs, and 1x 3V66/VCH clock output default 66MHz
• 9x PCI synchronous clocks, 3 free running
• 2x 48MHz clock outputs for USB and DOT, 1x 24_48MHz for I/O chip, and 3x REF 14.318MHz clock outputs
• SRC/AGP/PCI clock out supports synchronous and asynchronous mode
• I²C 2-Wire serial interface supports block and byte mode read/write
• Step-less frequency programming and programmable registers to enable/stop each output and select modes
• Smooth frequency switch with selections from 100 to 400MHz
• +/- 0.25% center type spread spectrum in table mode or programmable S.S.T scale to reduce EMI
• Watch Dog Timer and RESET# output pins