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ICS9248-81 - Frequency Generator & Integrated Buffer

Datasheet Summary

Description

The ICS9248-81 is the single chip clock solution for Desktop/ Notebook designs using the SIS style chipset.

It provides all necessary clock signals for such a system.

Spread spectrum may be enabled through I2C programming.

Features

  • • Generates the following system clocks: - 3 CPU(2.5V/3.3V) up to 133.3MHz. - 6 PCI(3.3V) (including 1 free-running) - 13 SDRAMs(3.3V) up to 133.3MHz. - 3 REF (3.3V) @ 14.318MHz - 1 clock @ 24/14.3 MHz selectable output for SIO - 1 Fixed clock at 48MHz (3.3V) - 1 IOAPIC @ 2.5V / 3.3V • Skew characteristics: - CPU – CPU.

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Datasheet preview – ICS9248-81

Datasheet Details

Part number ICS9248-81
Manufacturer Renesas
File Size 1.00 MB
Description Frequency Generator & Integrated Buffer
Datasheet download datasheet ICS9248-81 Datasheet
Additional preview pages of the ICS9248-81 datasheet.

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Full PDF Text Transcription

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ICS9248- 81 Frequency Generator & Integrated Buffers General Description The ICS9248-81 is the single chip clock solution for Desktop/ Notebook designs using the SIS style chipset. It provides all necessary clock signals for such a system. Spread spectrum may be enabled through I2C programming. Spread spectrum typically reduces system EMI by 8dB to 10dB. This simplifies EMI qualification without resorting to board design iterations or costly shielding. The ICS9248-81 employs a proprietary closed loop design, which tightly controls the percentage of spreading over process and temperature variations. Serial programming I2C interface allows changing functions, stop clock programming and frequency selection.
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