General Description

The ICS9150-08 generates all clocks required for high speed RISC or CISC microprocessor systems such as Intel PentiumPro or Cyrix. Eight different reference frequency multiplying factors are selectable.

Features

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

• 2.5V outputs: CPU, IOAPIC

• 20 ohm CPU clock output impedance

• 20 ohm PCI clock output impedance

• Skew from CPU (earlier) to PCI clock - 1 to 4 ns, center 2.6 ns.

• No external load cap for CL=18pF crystals

• ±250 ps CPU, PCI clock skew

• 250ps (cycle to cycle) CPU jitter

• Smooth CPU frequency switching from 50 to 133 MHz

• I2C interface for programming

• 2ms power up clock stable time

• Clock duty cycle 45-55.

• 56 pin 300 mil SSOP package

• 3.3V operation, 5V tolerant inputs (with series R)

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