Clock for Intel® Chipsets

The W83195BG-120 is a Clock Synthesizer for Intel 915/945 chipsets, which provides all clocks required for the high-speed microprocessor and step-less frequency programming and 32 different frequencies of CPU, PCI, and PCI-E clocks setting, support SRC 100MHz for SATA and DOT 96MHz clock outputs, all clocks are externally selectable with smooth transitions.

W83195BG-120 support I²C serial bus interface to program the registers to enable or disable each clock outputs and provides -0.5% down type spread spectrum or programmable S.S.T. scale to reduce EMI, and also has watchdog timer and reset output pin to support auto-reset when systems stop functioning caused by improper frequency setting. It accepts a 14.318 MHz reference crystal as its input and runs on a 3.3V supply.

• 2 pair 0.7 V current mode Differential clock outputs for CPU, 6 pairs for PCI-Express.
• 1 pair 0.7V current mode Differential clock 100MHz outputs for SRC and 1 pair 96MHz outputs for DOT.
• 1 pair 0.7 V current mode Differential clock outputs select for CPUCLK_ITP.
• 7x PCI synchronous clocks include 3x PCI clock free running.
• 1 24_48Mhz clock for super I/O, 1x 48 MHz clock output for USB, and 1x 14.318MHz REF clock outputs.
• Smooth frequency switch with selections from 100 to 400MHz.
• Step-less frequency programming, and programmable S.S.T. scale to reduce EMI in M/N mode.
• I²C 2-wire serial interface and support byte read/write and block read/write.
• -0.5% down type spread spectrum in H/W and software select mode.
• Programmable registers to enable/disable each output and select modes.
• Programmable clock outputs slew rate control and skew control.
• Watch Dog Timer and RESET# output pins.