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W83194R-KX Datasheet

  • W83194R-KX

  • 133MHZ 3-DIMM K7 CLOCK

  • 13頁

  • WINBOND

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W83194R-KX
133MHZ 3-DIMM K7 CLOCK
1.0 GENERAL DESCRIPTION
The W83194R-KX is a clock generator which provides all clocks required for AMD K7 system.
W83194R-KX provides one differential pair CPU clock open drain outputs up to 143MHz which are
externally selectable with smooth transitions. W83194R-KX also provides 6 PCI clocks and 13
SDRAM clocks controlled by the none-delay buffer_in pin.
The W83194R-KX accepts a 14.318 MHz reference crystal as its input and runs on a 3.3V supply.
Spread spectrum built in at 鹵0.5% or 鹵0.25% to reduce EMI. Programmable stopping individual clock
2
outputs and frequency selection through I C interface. The device meets the Pentium power-up
stabilization, which requires CPU and PCI clocks be stable within 2 ms after power-up.
High drive six PCI and thirteen SDRAM CLOCK outputs typically provide greater than 1 V /ns slew
rate into 30 pF loads. Two CPU CLOCK outputs typically provide better than 1 V /ns slew rate into 20
pF loads, when maintaining 50鹵 5% duty cycle. The fixed frequency outputs, such as REF, 24MHz,
and 48 MHz provide better than 0.5V /ns slew rate.
2.0 PRODUCT FEATURES
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Supports AMD K7 CPU with I C.
One pair of differential CPU clocks
One chipset clock
13 SDRAM clocks for 3 DIMMs
6 PCI synchronous clocks
Optional single or mixed supply:
(Vddq3=Vddq2 =3.3V) or (Vddq3 = 3.3V, Vddq2 = 2.5V)
< 250ps skew among CPU clocks
< 250ps skew among PCI clocks
< 5ns propagation delay SDRAM from buffer input
Skew from CPU(earlier) to PCI clock 1.5 to 4ns, center 2.6ns.
Smooth frequency switch with selections from 66.8 MHz to 143 MHz CPU
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I C 2-Wire serial interface and I C read back
鹵 0.25% or 鹵 0.5% spread spectrum function to reduce EMI
Programmable registers to enable/stop each output and select modes
(mode as Tri-state or Normal )
One 48 MHz for USB & one 24 MHz for super I/O
48-pin SSOP package
2
-1-
Publication Release Date: Nov. 1999
Revision 0.35

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