ICS9250-13 - Frequency Generator & Integrated Buffers

The ICS9250-13 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 externally selectable with smooth frequency transitions.

• • • • • • • • • • • • • • • • 3.3V outputs: SDRAM, PCI, REF, 48/24MHz 2.5V or 3.3V outputs: CPU 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 400ps (cycle to cycle) CPU jitter Smooth frequency switch, with selections from 50 to 83.3 MHz CPU. I2C interface for programming 2ms power up clock stable time Clock duty cycle 45-55%. 56 pin 300 mil.