General Description

The ICS9148-53 generates all clocks required for high speed RISC or CISC microprocessor systems such as Intel PentiumPro, AMD or Cyrix. Sixteen different reference frequency multiplying factors are externally selectable with smooth frequency transitions.

特性 Features

? Generates the following system clocks:

- 3 CPU(2.5V/3.3V) up to 150MHz.

- 7 PCI(3.3V) (including one free running PCICLK)

- 2AGP(3.3V) @ 2 x PCI

- 13 SDRAMs(3.3V) up to 150MHz

- 1 REF (3.3V) @ 14.318MHz

- 1 Fixed clock 3.3V @ 48MHz

? Skew characteristics:

- CPU - CPU<250ps

- CPU(early) - PCI : 1-4ns

? Supports Spread Spectrum modulation & I2C programming for Power Management, Frequency Select

? Efficient Power management scheme through power down CPU, PCI, AGP and CPU_STOP clocks.

? Uses external 14.318MHz crystal

? 48 pin 300mil SSOP.

? Read back of FS pin values from I2C