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. FEATURES • Supports PentiumÔ, PentiumÔ Pro, PentiumÔ II, AMD and Cyrix CPUs with I2C. • 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 selections from 50 MHz to 112 MHz CPU. (W83193R-04A) • I2C 2-Wire serial interface and I2C read back. • 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 • Packaged in 48-pin SSOP
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