w83194br-323 Winbond Electronics Corp America, w83194br-323 Datasheet - Page 4

• Manufacturer Part Number: w83194br-323
• Description: Clock For Intel Chipsets
• Manufacturer: Winbond Electronics Corp America

W83194BR-323/W83194BG-323
STEPLESS CLOCK FOR INTEL BROOKDALE CHIPSET
1. GENERAL DESCRIPTION
The W83194BR-323 is a Clock Synthesizer for Intel Brook dale 845 chipset.
W83194BR-323
provides all clocks required for high-speed microprocessor and provides step-less frequency
programming and 32 different frequencies of CPU, PCI, and 3V66 clocks setting. All clocks are
externally selectable with smooth transitions.
2
The W83194BR-323 provides I
C serial bus interface to program the registers to enable or disable
each clock outputs and provides -0.5% and +/-0.25% center type spread spectrum or programmable
S.S.T. scale to reduce EMI.
The W83194BR-323 also has watchdog timer and reset output pin to support auto-reset when
systems hanging caused by improper frequency setting.
The W83194BR-323 accepts a 14.318 MHz reference crystal as its input and runs on a 3.3V supply.
High drive PCI CLOCK outputs typically provide greater than 1 V /ns slew rate into 30 pF loads. The
fixed frequency outputs as REF and 48 MHz provide better than 0.5V /ns slew rate.
2. PRODUCT FEATURES
3 Differential pairs of CPU clock outputs
• 4 3V66 clock outputs
• 10 PCI synchronous clocks
• 24_48Mhz clock output for super I/O.
• 48 MHz clock output for USB.
• Skew form CPU to PCI clock 1 to 4 ns, center 2.6 ns
• Smooth frequency switch with selections from 66.8 to 200MHz
• Step-less frequency programming
2
• I
C 2-Wire serial interface and support byte read/write and block read/write.
• -0.5% and +/- 0.25% center type spread spectrum
• Programmable S.S.T. scale to reduce EMI
• Programmable registers to enable/stop each output and select modes
• Watch Dog Timer and RESET# output pins
• 48-pin SSOP package
Publication Release Date: March 2006
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Revision 2.1