Clock for Intel® Chipsets

The W83194BG-619 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-619 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. It also has watchdog timer and reset output pin to support auto-reset when systems hanging caused by improper frequency setting.

W83194BG-619 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 pairs current mode differential clock for SRC
• 3x 3V66 clock outputs, and 1x 3V66/VCH clock output default 66MHz
• 11x PCI synchronous clocks, 3 free running, and 2x REF 14.318MHz clock outputs
• 1x 48MHz clock outputs for USB and DOT, and 1x 24_48MHz for I/O chip, default 48MHz
• 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 smooth frequency switch with selections from 100 to 400MHz
• Programmable clock outputs Slew rate control and Skew control
• +/- 0.25% center type spread spectrum in table mode or programmable S.S.T. scale to reduce ENU
• Programmable registers to enable/stop each output and select modes
• Watch Dog Timer and RESET# output pins