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W83195R-08 Datasheet(PDF) 1 Page - Winbond |
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W83195R-08 Datasheet(HTML) 1 Page - Winbond |
1 / 18 page W83195R-08 150MHZ 4-DIMM CLOCK Publication Release Date: Mar. 1999 - 1 - Revision 0.30 1.0 GENERAL DESCRIPTION The W83195R-08 is a Clock Synthesizer which provides all clocks required for high-speed RISC or CISC microprocessor such as Intel Pentium II. W83195R-08 provides sixteen CPU/PCI frequencies which are externally selectable with smooth transitions. W83195R-08 also provides 17 SDRAM clocks controlled by the none-delay buffer_in pin. The W83195R-08 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 I 2C interface. The device meets the Pentium power-up stabilization, which requires CPU and PCI clocks be stable within 2 ms after power-up. Using dual function pin for the slots(ISA, PCI, CPU, DIMM) is not recommend. The add on cards may have a pull up or pull down. High drive seven PCI and 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, when maintaining 50¡Ó 5% duty cycle. The fixed frequency outputs, such as REF, 24MHz and 48 MHz provide better than 0.5V /ns slew rate. 2.0 PRODUCT FEATURES • Supports Pentium™ II CPU with I2C. • 3 CPU clocks (one free-running CPU clock) • 17 SDRAM clocks for 4 DIMs • 7 PCI synchronous clocks • Two IOAPIC clocks for multiprocessor support • 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 • < 250ps skew among PCI clocks • < 5ns propagation delay SDRAM from buffer input • Skew from CPU(earlier) to PCI clock -1 to 4ns, center 2.6ns. • Smooth frequency switch with selections from 50 MHz to 133 MHz CPU • I 2C 2-Wire serial interface and I2C read back • ¡Ó0.25% or ¡Ó0.5% center type 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 • One 48 MHz for USB & one 24 MHz for super I/O • 56-pin SSOP package |
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