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ICS9159-20 Datasheet(PDF) 1 Page - Integrated Circuit Systems |
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ICS9159-20 Datasheet(HTML) 1 Page - Integrated Circuit Systems |
1 / 5 page Integrated Circuit Systems, Inc. General Description Features ICS9159-20 Frequency Generator for SIS551X and SIS6205 Chip Set Systems 9159-20 Rev B 040597 Block Diagram The ICS9159-20 is a low-cost frequency generator designed specifically for SIS551X chip set and SIS6205 VGA control- ler. The integrated buffer minimizes skew. A 14.31818 MHz XTAL oscillator provides the reference clock to generate standard Pentium™ frequencies. The CPU clock makes grad- ual frequency transitions without violating the PLL timing of internal microprocessor clock multipliers. Both synchronous and asynchronous bus designs are sup- ported. For chip sets that require an early CPU clock, the buffers are driven by the CPU clock. In this configuration, the CPU clock becomes the early clock and the output of the uncommitted buffers become the bus synchronized bus clocks. • One selectable CPU clocks operate up to 66.66 MHz • 5 uncommitted buffers • Maximum CPU jitter of ±200ps • 7 BUS clocks support sync or async bus operation • 500ps skew window for all synchronous clock edges • Integrated buffer outputs drive up to 30pF loads • 3.1V - 3.5V supply range • 28-pin 300-mil SOIC package • Supports chip sets requiring early CPU clocking Pentium is a trademark of Intel Corporation. Functionality All frequencies in MHz, assuming 14.318 MHz input. Applications • Ideal for green Pentium and P6 PCI systems based on the SIS5596 chip set Pin Configuration 28-Pin SOIC 3.3V±10%, 0-70°C Crystal (X1, X2) = 14.318181 MHz FS1 FS0 REF (MHz) CPU (MHz) BCLK (MHz) BSEL=1 BSEL=0 0 0 Tistate Tristate Tristate Tristate 0 1 14.318 50 25 33.33 1 0 14.318 60 30 33.33 1 1 14.318 66.66 33.33 33.33 ICS reserves the right to make changes in the device data identified in this publication without further notice. ICS advises its customers to obtain the latest version of all device data to verify that any information being relied upon by the customer is current and accurate. |
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