Description

The ICS9248BF-87 is a Clock Synthesizer chip designed for Pentium and PentiumPro CPU-based Desktop/Notebook systems. It provides all necessary clock timing for the system.

Specifications and Features

• Generates system clocks for CPU, IOAPIC, PCI, 14.314 MHz REF (0:2), USB, and Super I/O

• Supports single or dual processor systems

• Supports Spread Spectrum modulation for CPU & PCI clocks, down spread -0.5%

• Skew from CPU (earlier) to PCI clock (rising edges for 100/33.3MHz) 1.5 to 4ns

• Two fixed outputs at 48MHz

• Separate 2.5V and 3.3V supply pins

• 2.5V or 3.3V output: CPU, IOAPIC

• 3.3V outputs: PCI, REF, 48MHz

• No power supply sequence requirements

• Uses external 14.318MHz crystal, no external load cap required for CL=18pF crystal

• 48 pin 300 mil SSOP

Application Scenarios

This Clock Synthesizer chip is specifically designed for Pentium and PentiumPro CPU-based Desktop/Notebook systems, providing reliable and accurate clock timing for these systems.

Comparison

- Generates system clocks for multiple components, including the CPU, IOAPIC, and PCI

- Supports single or dual processor systems

- Supports Spread Spectrum modulation for improved performance

- Provides separate supply pins for different voltage requirements

- No power supply sequence requirements

- Requires the use of an external 14.318MHz crystal

- Limited to use in Pentium and PentiumPro CPU-based systems