ICS9250-13 Datasheet PDF - Integrated Circuit Systems Frequency Generator & Integrated Buffers Specs

ICS9250-13 - Frequency Generator & Integrated Buffers

Datasheet Summary

Description

The ICS9250-13 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: SDRAM, PCI, REF, 48/24MHz 2.5V or 3.3V outputs: CPU 20 ohm CPU clock output impedance 20 ohm PCI clock output impedance Skew from CPU (earlier) to PCI clock - 1 to 4 ns, center 2.6 ns. No external load cap for CL=18pF crystals ±250 ps CPU, PCI clock skew 400ps (cycle to cycle) CPU jitter Smooth frequency switch, with selections from 50 to 83.3 MHz CPU. I2C interface for programming 2ms power up clock stable time Clock duty cycle 45-55%. 56 pin 300 mil.

Datasheet Details

Part number	ICS9250-13
Manufacturer	Integrated Circuit Systems
File Size	563.18 KB
Description	Frequency Generator & Integrated Buffers
Datasheet	ICS9250-13 Datasheet
Additional preview pages of the ICS9250-13 datasheet.

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Full PDF Text Transcription

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Integrated Circuit Systems, Inc. ICS9250-13 Frequency Generator & Integrated Buffers for PENTIUM/ProTM General Description The ICS9250-13 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. 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 ICS9250-13 employs a proprietary closed loop design, which tightly controls the percentage of spreading over process and temperature variations. Features 3.

Published: Dec 11, 2005 |