w83194br-372 Winbond Electronics Corp America, w83194br-372 Datasheet - Page 4

• Manufacturer Part Number: w83194br-372
• Description: Clock Generator For Sis 746/748 Chipsets
• Manufacturer: Winbond Electronics Corp America

1. GENERAL DESCRIPTION
The W83194BR-372 is a Clock Synthesizer for SIS 746/748 chipset. W83194BR-372 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.
The W83194BR-372 provides I
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-372 accepts a 14.318 MHz reference crystal as its input and runs on a 3.3V supply.
2. PRODUCT FEATURES
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1 2.5V open drain Differential pairs clock outputs for CPU
1 2.5V open drain singled-ended clock output for chipset host bus.
2 3.3V ZCLK clock outputs
2 AGP clock outputs
8 PCI synchronous clocks
2 2.5V IOAPIC clock outputs
1 24_48Mhz clock output for super I/O.
1 48 MHz clock output for USB.
3 14.318MHz REF clock outputs.
ZCLK/AGP/PCI clock out supports synchronous and asynchronous mode
Smooth frequency switch with selections from 100 to 200MHz
Step-less frequency programming
I
-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
48-pin SSOP package
2
C 2-Wire serial interface and support byte read/write and block read/write.
2
C serial bus interface to program the registers to enable or disable
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Publication Release Date: April 13, 2005
W83194BR-372
Revision 1.1