W83193R-01

W83193R-01 83.MHZ 3-DIMM CLOCK 1.0 GENERAL DESCRIPTION The W83193R-01 is a Clock Synthesizer which provides all clocks required for high-speed RISC or CISC microprocessor such as Intel PentiumPro , AMD or Cyrix. Eight different frequency of CPU and PCI clocks are externally selectable with smooth transitions. The W83193R-02/-04 also provides I2C serial bus interface to program the registers to enable or disable each clock outputs and choose the 0.6% or 1.5% center type spread spectrum. The W83193R-01 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¡Ó 5% 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 DIMs. 7 PCI synchronous clocks. One IOAPIC clock for multiprocessor support. Optional single or mixed supply: (Vdd = Vddq3 = Vddq2 = 3.3V) or (Vdd = Vddq3 = 3.3V, Vddq2 = 2.5V) < 250ps skew among CPU and SDRAM clocks. < 250ps skew among PCI clocks. Smooth frequency switch with selections from 50 MHz to 83.3 MHz CPU. I2C 2-Wire serial interface. 0.6% or 1.5% center type spread spectrum function to reduce EMI. Programmable registe...