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