Frequency Generator & Integrated Buffers for PENTIUM/ProTM

General Description The ICS9248-39 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. Features • 3.3V outputs: SD

Frequency Generator & Integrated Buffers for PENTIUM/ProTM

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 - 1.5 to 4 ns, center 2.6 ns. • No external load cap for CL=18pF crystals • ±175 ps CPU clock skew