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General Description The ICS9179-06 generates low skew clock buffers required for high speed RISC or CISC microprocessor systems such as Intel PentiumPro. An output enable is provided for testability. The device is a buffer with low output to output skew. This is a zero delay buffer device, using an internal PLL. This buffer can be used for phase synchronization to a master clock. With the wide PLL loop BW, this buffer is compatible to Spread Spectrum input clocks from clock generator products such as the ICS9148-27. Features • Zero delay buffer, 16 outputs • Supports up to four SDRAM DIMMS • Wide PLL loop bandwidth makes this part ideal in Spread Spectrum applications. • Skew Input to FB_IN –250ps default, with selectable skew -2.7, +2.0, -0.7ns nominal. • Synchronous clocks skew matched to 250ps window on output. • 33 to 133MHz input or output frequency. • I2C Serial Configuration interface to allow individual clocks to be stopped, or selectable delays. • Multiple VDD, VSS pins for noise reduction • Slew rate 1.5V/ns into 30pF. • VDD = 3.3 –5%, 0 to 70°C • All outputs (0:15) tristate with OE low (FB_OUT stays running). • 48-Pin SSOP package
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