w83195bg-120 Winbond Electronics Corp America, w83195bg-120 Datasheet - Page 5

• Manufacturer Part Number: w83195bg-120
• Description: Winbond Clock Generator W83195br-120/w83195bg-120 For Intel 915/945 Chipset
• Manufacturer: Winbond Electronics Corp America

W83195BR-120/W83195BG-120
1. GENERAL DESCRIPTION
The W83195BR-120 is a Clock Synthesizer for Intel 915/945 chipsets. W83195BR-120 provides all
clocks required for the high-speed microprocessor and provides 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.
2
The W83195BR-120 provides I
C 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.
The W83195BR-120 also has watchdog timer and reset output pin to support auto-reset when
systems stop functioning caused by improper frequency setting.
The W83195BR-120 accepts a 14.318 MHz reference crystal as its input and runs on a 3.3V supply.
2. PRODUCT FEATURES
• 2 pair 0.7 V current mode Differential clock outputs for CPU.
• 1 pair 0.7V current mode Differential clock 100MHz outputs for SRC.
• 1 pair 0.7V current mode Differential 96MHz clock outputs for DOT.
• 6 pair 0.7V current mode Differential clock outputs for PCI-Express.
• 1 pair 0.7 V current mode Differential clock outputs select for CPUCLK_ITP.
• 7 PCI synchronous clocks include 3 PCI clock free running.
• 1 24_48Mhz clock output for super I/O.
• 1 48 MHz clock output for USB.
• 1 14.318MHz REF clock outputs.
• Smooth frequency switch with selections from 100 to 400MHz.
• Step-less frequency programming.
2
• I
C 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 S.S.T. scale to reduce EMI in M/N 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.
• 56 pin SSOP package.
Publication Release Date: January 2006
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Revision 0.61