W83195BR-118/W83195BG-118
STEPLESS FOR INTEL 915/945 CHIPSETS
1. GENERAL DESCRIPTION
The W83195BR-118 is a Clock Synthesizer for Intel P4 processors and Intel Grandsdale chipsets.
W83195BR-118 provides all clocks required for high-speed microprocessor and provides step-less
frequency programming, 32 different frequencies of CPU, PCI, PCI-Express clocks setting.
Simultaneously W83195BR-118 supports SRC 100MHz for SATA and DOT 96MHz clock outputs for
integrated graphic chipsets. All clocks are externally selectable with smooth transitions.
The W83195BR-118 programs the registers to enable or disable each clock outputs through I
2
C serial
bus interface and provides -0.5% down type spread spectrum or programmable spread spectrum
scale to reduce EMI.
The W83195BR-118 also has watchdog timer and reset output pin to support auto-reset when
systems hanging caused by improper frequency setting.
The W83195BR-118 is driven with a 14.318 MHz reference crystal and runs on a 3.3V supply.
2. PRODUCT FEATURES
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2 pair 0.7 V current mode Differential clock outputs for CPU
1 pair 0.7V current mode Differential 100 MHz clock outputs for SRC.
1 pair 0.7V current mode Differential 96MHz clock outputs for DOT.
5 pair 0.7V current mode Differential clock outputs for PCI-Express
6 PCI clock outputs for PCI
3 PCI clock free running outputs for PCI
1 24_48Mhz clock output for super I/O.
1 48 MHz clock output for USB.
2 14.318MHz REF clock outputs.
Step-less frequency programming
I
2
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 spread spectrum scale to reduce EMI in M/N mode
Programmable registers to enable/stop each output.
Programmable clock outputs to control slew rate and skew.
Watch Dog Timer and RESET# output pins
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56 pin SSOP package
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Publication Release Date: May 2006
Revision 0.81
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