ICS9169C-232

www.DataSheet4U.com Integrated Circuit Systems, Inc. ICS9169C-232 Frequency Generator for Pentium™ Based Systems General Description The ICS9169C-232 is a low-cost frequency generator designed specifically for Pentium and Pentium-Pro based chip set systems. The integrated buffer minimizes skew and provides all the clocks required. A 14.318 MHz XTAL oscillator provides the reference clock to generate standard Pentium frequencies. The CPU clock makes gradual frequency transitions without violating the PLL timing of internal microprocessor clock multipliers. A raised frequency setting of 68.5 MHz is available for Turbo-mode of the 66.8 MHz CPU. The ICS9169C-232 contains 8 CPU clocks, 6 PCI clocks, 1 REF at 48MHz and 1 at 24MHz. Either synchronous (CPU/2) or asynchronous (32 MHz) PCI bus operation can be selected by latching data on BSEL input. Features Strong output drive. Eight selectable CPU clocks operate up to 83.3 MHz Frequency selections include Turbo-mode speed of 68.5 MHz Maximum CPU jitter of ±200ps Six BUS clocks support sync or async bus operation 250ps skew window for CPU outputs, 500ps skew window for BUS outputs CPU clocks to BUS clocks skew 1-4 ns (CPU early) 48 MHz clock for USB support & 24 MHz clock for FD. Logic inputs latched at Power-On for frequency selection saving pins as Input/Output Integrated buffer outputs drive up to 30pF loads 3.0V - 3.7V supply range, CPU (1:6) outputs 2.5V (2.375 - 2.6V) VDD option 28-pin SOIC or SSOP p...