General Description

The ICS9147-12 is a Clock Synthesizer chip for Pentium and PentiumPro plus Cyrix CPU based Desktop/Notebook systems that will provide all necessary clock timing.

Features

• Generates system clocks for CPU, IOAPIC, SDRAM, PCI, plus 14.318 MHz REF(0:2), USB, Plus Super I/O

• Supports single or dual processor systems

• Supports Intel 60, 66.8MHz, Cyrix 55, 75MHz plus 83.3 and 68MHz (Turbo of 66.6) speeds.

• Synchronous clocks skew matched to 250ps window on CPU, SDRAM and 500ps window on PCI clocks

• CPU clocks to PCI clocks skew 1-4ns (CPU early)

• Two fixed outputs, 48MHz and 24 MHz

• Separate 2.5V and 3.3V supply pins

- 2.5V or 3.3V output: CPU, IOAPIC

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

• No power supply sequence requirements

• 48 pin 300 mil SSOP