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W83194R-17

100MHZ AGP CLOCK FOR SIS CHIPSET

Winbond 

W83194R-17/-17A

1.0 GENERAL DESCRIPTION

100MHZ AGP CLOCK FOR SIS CHIPSET

The W83194R-17/-17A is a Clock Synthesizer which provides all clocks required for high-speed RISC

or CISC microprocessor such as Intel PentiumII, PentiumPro , AMD or Cyrix. Eight different

frequency of CPU, AGP and PCI clocks are externally selectable with smooth transitions. The

W83194R-17/-17A provides AGP clocks especially for clone chipset. The highest CPU frequency

provided by the W83194R-17 is up to 100MHz, but the one of W83194R-17A is up to 133MHz.

The W83193R-17/-17A provides I2C serial bus interface to program the registers to enable or disable

each clock outputs and choose the 0.5% or 1.5% center type spread spectrum to reduce EMI.

The W83194R-17/-17A 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¡Ó5% duty cycle. The fixed frequency outputs as REF, 24MHz, and 48 MHz

provide better than 0.5V /ns slew rate.

2.0 PRODUCT FEATURES

• Supports Pentium™, Pentium™ Pro, Pentium™ II, AMD and Cyrix CPUs with I2C.

• 4 CPU clocks

• 12 SDRAM clocks for 3 DIMMs

• Two AGP clocks

• 6 PCI synchronous clocks.

• Optional single or mixed supply:

(Vdd = Vddq3 = Vddq2 = Vddq2b = 3.3V) or (Vdd =Vddq2 = Vddq3 = 3.3V, Vddq2b = 2.5V)

• Skew form CPU to PCI clock -1 to 4 ns, center 2.6 ns, AGP to CPU sync. skew 0 ns (250 ps)

• Smooth frequency switch with selections from 60 MHz to 133 MHz CPU

• I2C 2-Wire serial interface and I2C read back

• ¡Ó0.5% or ¡Ó1.5% 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: Sep. 1998

-1-

Revision 0.20

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