IDT74FCT3907 Datasheet | Integrated Device Technology

IDT74FCT3907 3.3V PC CLOCK SYNTHESIZER 3.3V PENTIUM™ CLOCK SYNTHESIZER IDT74FCT3907 ADVANCE INFORMATION MERCIAL TEMPERATURE RANGES Integrated Device Technology, Inc. Features : - 0.5 MICRON CMOS Technology - Generates keyboard, floppy disk, system reference, PCI and CPU clocks - 6 copies of PCI clock & 4 copies of CPU clock available - 14.31818MHz crystal input - CPU clock output skew <250ps Bus clock output skew <500ps - 0.03% output frequency accuracy - Power-on reset - Selectable CPU clock frequency (50/60/66.66MHz) - Internal loop filter - VCC = 3.3 ±0.3V - Available in 28 pin SOIC - Supports Pentium™ processor based designs - Meets Intel Pentium™ processor 3.3V Clock Driver specification (External Draft 1.0) DESCRIPTION: The IDT74FCT3907 Clock synthesizer is built using advanced dual metal CMOS technology. This device uses a 14.31818 MHz crystal input to synthesize the various motherboard clock frequencies. The output frequencies supported by the IDT74FCT3907 are as follows: Reference clocks (2) = 14.31818MHz Keyboard clock (1) = 12MHz Floppy disk clock (1) = 24MHz CPU clock (4) = 50/60/66.66 MHz (Selectable by SEL pins) Bus clock (6) = CPU clock ÷ 2 The SEL0, 1 pins are used to choose appropriate CPUCLK and PCICLK frequencies or to put the device in a test mode. In the test mode, the device outputs various divisors of the test clock frequency. Refer to the function table in this datasheet for details on the different operating modes. FUNCTIONAL BLOCK DIAGRAM 1 X1 (14.31818 MHz) X2 Oscillator Peripheral Clock Synthesizer Block KBCLK (12MHz) FDCLK (24MHz) 4 SEL0, 1 CPU Clock Synthesizer Block CPUCLK 0-3 PCICLK 0-5 REF CLK 0,1 (14.31818...