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W83194BR-S Datasheet

  • W83194BR-S

  • 200MHZ 2-DIMM CLOCK FOR SOLANO CHIPSET

  • 17頁

  • WINBOND

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W83194BR-S
200MHZ 2-DIMM CLOCK FOR SOLANO CHIPSET
1.0
GENERAL DESCRIPTION
The W83194BR-S is a Clock Synthesizer for Intel 815 Solano chipset.
W83194BR-S provides all
clocks required for high-speed RISC or CISC microprocessor and also provides 64 different
frequencies of CPU, SDRAM, PCI, 3V66, IOAPIC clocks frequency setting.
All clocks are externally
selectable with smooth transitions.
The W83194BR-S provides I
2
C serial bus interface to program the registers to enable or disable each
clock outputs and provides 0.25% and 0.5% center type spread spectrum to reduce EMI.
The W83194BR-S provides stepless frequency programming by controlling the VCO freq. and the
clock output divisor ratio.
Also the skew of CPU, SDRAM and 3V66 clock outputs are
programmable. A watch dog timer is quipped and when time out, the RESET# pin will output 4ms pulse
signal.
The W83194BR-S accepts a 14.318 MHz reference crystal as its input and runs on a 3.3V supply.
High drive PCI and SDRAM CLOCK outputs typically provide greater than 1 V /ns slew rate into 30 pF
loads. CPU CLOCK outputs typically provide better than 1 V /ns slew rate into 20 pF loads as
maintaining 50鹵 5% duty cycle.
The fixed frequency outputs as REF, 24MHz, and 48 MHz provide
better than 0.5V /ns slew rate.
2.0
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PRODUCT FEATURES
2 CPU clocks
3 3V66 for chipset and AGP clocks
9 SDRAM clocks for 2 DIMMs
7 PCI synchronous clocks.
Optional single or mixed supply:
(VddR = VddP=VddS = Vdd48 = Vdd3 = 3.3V, VddLAPIC=VddLCPU=2.5V)
Skew form CPU to PCI clock -1 to 4 ns, center
2.6 ns
Smooth frequency switch
with selections from 66.8 to
200
MHz
I
2
C 2-Wire serial interface and I
2
C read back
0.25% and 0.5% center type spread spectrum
Programmable registers to enable/stop each output and select modes
Two 48 MHz pins for USB
24 MHz for super I/O
48-pin SSOP package
Publication Release Date:June 2000
- 1 -
Revision 0.42

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