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W83193R-01 Datasheet

  • W83193R-01

  • 83.MHZ 3-DIMM CLOCK

  • 19頁(yè)

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W83193R-01
83.MHZ 3-DIMM CLOCK
1.0 GENERAL DESCRIPTION
The W83193R-01 is a Clock Synthesizer which provides all clocks required for high-speed RISC or
CISC microprocessor such as Intel PentiumPro , AMD or Cyrix. Eight different frequency of CPU and
PCI clocks are externally selectable with smooth transitions.
The W83193R-02/-04 also provides I
2
C serial bus interface to program the registers to enable or
disable each clock outputs and choose the 0.6% or 1.5% center type spread spectrum.
The W83193R-01 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
隆脫
5% duty cycle. The fixed frequency outputs as REF, 24MHz, and 48 MHz provide
better than 0.5V /ns slew rate.
2.0 PRODUCT FEATURES
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Supports Pentium鈩? Pentium鈩?Pro, Pentium鈩?II, AMD and Cyrix CPUs with I
2
C.
4 CPU clocks.
12 SDRAM clocks for 3 DIMs.
7 PCI synchronous clocks.
One IOAPIC clock for multiprocessor support.
Optional single or mixed supply:
(Vdd = Vddq3 = Vddq2 = 3.3V) or (Vdd = Vddq3 = 3.3V, Vddq2 = 2.5V)
< 250ps skew among CPU and SDRAM clocks.
< 250ps skew among PCI clocks.
Smooth frequency switch with selections from 50 MHz to 83.3 MHz CPU.
I
2
C 2-Wire serial interface.
0.6% or 1.5% center type spread spectrum function to reduce EMI.
Programmable registers to enable/stop each output and select modes.
(mode as Tri-state, or Normal )
MODE pin for power Management.
48 MHz for USB.
24 MHz for super I/O.
48-pin SSOP package.
Publication Release Date: May 1998
Revision 0.20
-1-

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