w83194br-655 Winbond Electronics Corp America, w83194br-655 Datasheet - Page 5

• Manufacturer Part Number: w83194br-655
• Description: Clock For Sis Chipsets Winbond Clock Generator
• Manufacturer: Winbond Electronics Corp America

W83194BR-655/W83194BG-655
1. GENERAL DESCRIPTION
The W83194BR-655 is a Clock Synthesizer for SIS 655 chipset with 964 South Bridge. W83194BR-
655 provides all clocks required for high-speed microprocessor and provides step-less frequency
programming and 32 different frequencies of CPU, PCI, and AGP clocks setting, support two ZCLK
clock outputs; all clocks are externally selectable with smooth transitions.
2
The W83194BR-655 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-655 also has watchdog timer to support auto-reset when systems hanging caused by
improper frequency setting.
The W83194BR-655 accepts a 14.318 MHz reference crystal as its input and runs on a 3.3V supply.
2. PRODUCT FEATURES
• 2 pairs current mode Differential clock outputs for CPU
• 1 pairs current mode Differential clock output for SRC.
• 2 3.3V ZCLK clock outputs
• 2 AGP clock outputs
• 8 PCI synchronous clocks
• 1 24_48Mhz clock output for super I/O.
• 1 12/48 MHz clock output
• 2 14.318MHz REF clock outputs.
• ZCLK/AGP/PCI clock out supports synchronous and asynchronous mode
• Smooth frequency switch with selections from 100 to 274MHz
• 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
• Programmable clock outputs Skew control
• Watch Dog Timer and RESET# output pins
• 48-pin SSOP package
Publication Release Date: February 14, 2006
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Revision 1.0