W83194R-67A

W83194R-67A 100MHZ 3-DIMM CLOCK FOR VIA MVP4 1.0 GENERAL DESCRIPTION The W83194R-67A is a Clock Synthesizer which provides all clocks required for high-speed RISC or CISC microprocessor such as Intel Pentium , AMD and Cyrix. W83194R-67A provides sixteen CPU/PCI frequencies which are externally selectable with smooth transitions. W83194R-67AA also provides 13 SDRAM clocks controlled by the none-delay buffer_in pin. The W83194R-67A accepts a 14.318 MHz reference crystal as its input and runs on a 3.3V supply. Spread spectrum built in at ¡Ó0.5% or ¡Ó0.25% 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 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™ , AMD, Cyrix CPU with I2C. 4 CPU clocks (one free-running CPU clock) 13 SDRAM clocks for 3 DIMs 6 PCI synchronous clocks Optional single or mixed supply: (Vddq1=Vddq2 = Vddq3 = Vddq4 = VddL1 =VddL2= 3.3V) or (Vddq1= Vddq2 = Vddq3=Vddq4 = 3.3V, VddL1 = VdqL2 = 2.5V) < 250ps skew among CPU and SDRAM clocks < 4ns propagatio...