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W83194R-KX

133MHZ 3-DIMM K7 CLOCK

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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 ±0.5% or ±0.25% to reduce EMI. Programmable stopping individual clock

outputs and frequency selection through I2C 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± 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

• Supports AMD K7 CPU with I2C.

• 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

• I2C 2-Wire serial interface and I2C read back

• ± 0.25% or ± 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

Publication Release Date: Nov. 1999

-1-

Revision 0.35

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