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W83194BR-39B - STEP-LESS 3-DIMM CLOCK

General Description

The W83194BR-39B is a Clock Synthesizer which provides all clocks required for high-speed RISC or CISC microprocessor such as Intel Pentium II or Pentium III.

W83194BR-39B provides 64 CPU/PCI frequencies which are selectable with smooth transitions by hardware or software.

Key Features

  • Supports Pentium™ II and !!! CPU with I2C. 2 CPU clocks (one free-running CPU clock) 13 SDRAM clocks for 3 DIMMs 6 PCI synchronous clocks One IOAPIC clock for multiprocessor support Optional single or mixed supply: (Vddq1=Vddq2 = Vddq3 = Vddq4 = VddL1 =VddL2= 3.3V) or (Vddq1= Vddq2 = Vddq3=Vddq4 = 3.3V, VddL1 = VddL2 = 2.5V) < 250ps skew among CPU and SDRAM clocks < 250ps skew among PCI clocks < 5ns propagation delay SDRAM from buffer i.

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Full PDF Text Transcription (Reference)

The following content is an automatically extracted verbatim text from the original manufacturer datasheet and is provided for reference purposes only.

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W83194BR-39B STEP-LESS 3-DIMM CLOCK 1.0 GENERAL DESCRIPTION The W83194BR-39B is a Clock Synthesizer which provides all clocks required for high-speed RISC or CISC microprocessor such as Intel Pentium II or Pentium III. W83194BR-39B provides 64 CPU/PCI frequencies which are selectable with smooth transitions by hardware or software. W83194BR-39B also provides 13 SDRAM clocks controlled by the none-delay buffer_in pin. The W83194BR-39B provides step-less frequency programming by controlling the VCO freq. and the programmable PCI clock output divisor ratio. A watch dog timer is quipped and when time out, the RESET# pin will output 4ms pulse signal. The W83194BR-39B accepts a 14.318 MHz reference crystal as its input. Spread spectrum built in at ±0.5% or ±0.25% to reduce EMI.