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W83193R-04A

Winbond

83.3 MHZ 3-DIMM CLOCK

Preliminary W83193R-02/-04/-04A 83.3 MHZ 3-DIMM CLOCK 1.0 GENERAL DESCRIPTION The W83193R-02/-04/-04A is a Main board Cl...


Winbond

W83193R-04A

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Description
Preliminary W83193R-02/-04/-04A 83.3 MHZ 3-DIMM CLOCK 1.0 GENERAL DESCRIPTION The W83193R-02/-04/-04A is a Main board Clock Synthesizer which provides all clocks required for high-speed RISC or CISC microprocessor such as Intel PentiumPro, PentiumII, AMD or Cyrix. Eight different frequency of CPU and PCI clocks are externally selectable with smooth transitions. The W83193R-02/-04/-04A also 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. The W83193R-02/-04/-04A 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 1V /nS slew rate into 30 pF loads. CPU CLOCK outputs typically provide better than 1V /nS slew rate into 20 pF loads as maintaining 50 ±5% duty cycle. The fixed frequency outputs as REF, 24 MHz, and 48 MHz provide better than 0.5V /nS slew rate. 2.0 FEATURES Supports Pentium™, Pentium™ Pro, Pentium™ II, AMD and Cyrix CPUs with I C. 2 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 = VDDq2b = 3.3V) or (VDD = VDDq3 = 3.3V, VDDq2 = VDD2b = 2.5V) < 250 pS skew among CPU and SDRAM clocks. < 250 pS skew among PCI clocks. Smooth frequency switch with selections from 50 MHz to 83.3 MHz CPU. (W83193R-04) Smooth frequency switch with selec...




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