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

• Manufacturer Part Number: w83194br-sd
• Description: Winbond Clock Generator For Intel P4 Springdale Series Chipset
• Manufacturer: Winbond Electronics Corp America

W83194BR-SD/W83194BG-SD
CLOCK GEN. FOR INTEL P4 SPRINGDALE/PRESCOTT SERIES CHIPSET
1. GENERAL DESCRIPTION
The W83194BR-SD is a Clock Synthesizer for Intel P4 Springdale series chipset. W83194BR-SD
provides all clocks required for high-speed microprocessor and provides step-less frequency
programming and 32 different frequencies of CPU, SRC, PCI, and 3V66 clocks setting. All clocks are
externally selectable with smooth transitions.
2
The W83194BR-SD provides I
C serial bus interface to program the registers to enable or disable
each clock outputs and provides +/-0.25%, +/-0.5% center type and –0.5%, -1.0% down type spread
spectrum or programmable S.S.T. scale to reduce EMI.
The W83194BR-SD also has watchdog timer and reset output pin to support auto-reset when systems
hanging caused by improper frequency setting.
The W83194BR-SD accepts a 14.318 MHz reference crystal as its input and runs on a 3.3V supply.
2. FEATURES
• 2 pairs current mode differential clock for CPU and Chipset
• 1 pairs current mode differential clock for SRC
• 3 3V66 clock outputs
• 1 3V66/VCH clock output default 66MHz
• 9 PCI synchronous clocks, 3 free running
• 2 48MHz clock outputs for USB and DOT
• 1 24_48MHz for I/O chip, default 48MHz
• 3 REF 14.318MHz clock outputs
• SRC/AGP/PCI clock out supports synchronous and asynchronous mode
• 3V66 leads PCICLK from 1.5ns to 3.5ns
2
• I
C 2-Wire serial interface supports block and byte mode read/write
• Step-less frequency programming
• Smooth frequency switch with selections from 100 to 400MHz
• Programmable clock outputs Slew rate control and Skew control
• +/- 0.25% center type spread spectrum in table mode
• 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, 22, 2006
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Revision 1.2