General Description

The ICS9147-14 generates all clocks required for high speed RISC or CISC microprocessor systems such as Intel PentiumPro. Two bidirectional I/O pins (FS1,FS2) are latched at power-on to the functionality table, with FS0 selectable in real-time to toggle between conditions.

Features

• Four copies of CPU clock

• Twelve SDRAM (3.3V TTL), usable as AGP clocks

• Seven copies of PCICLK clock (synchronous with CPU clock/2 or CPU/2.5 for 75 and 83.3 MHz CPU)

• CPU clocks to PCICLK clocks skew 1-4ns, center 2.6ns.

• One IOAPIC clock @14.31818 MHz

• Two copies of Ref. clock @14.31818 MHz

• Ref. 14.31818 MHz Xtal oscillator input

• Separate VDDL1 for four CPU and single IOAPIC output buffers to allow 2.5V output (or Std. Vdd)

• One each 48/ 24 MHz (3.3 V TTL)

• 3.3V outputs: SDRAM, PCI, REF, 48/24MHz.

• 2.5V or 3.3V outputs: CPU, IOAPIC.

• 20 ohm CPU clock output impedance

• 20 ohm PCI clock output impedance

• 1.5ns rise time (30 pF loading)

• –250 ps CPU, PCI clock skew

• 350ps (cycle by cycle) CPU jitter

• 2ms Power up clock stable time

• 45-55 Clock duty cycle

• 48 pin 300 mil SSOP package

• 3.0V - 3.7V supply range w/2.5V compatible outputs