Datasheet > ICS9248-61

ICS9248-61

更新时间： 2024-09-24 22:55:27

品牌	Logo	应用领域
矽成 - ICSI		/
页数	文件大小	规格书
9页	292K
描述
Frequency Timing Generator for Pentium II Systems

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ICS9248-61 数据手册

Integrated

Circuit

Systems, Inc.

ICS9248-61

Frequency Timing Generator for Pentium II Systems

General Description

Features

Generates the following system clocks:

The ICS9248-61 is the Main clock solution for Notebook

designs using the Intel 440BX style chipset. Along with an

SDRAM buffer such as the ICS9179-03, it provides all

necessary clock signals for such a system.

-2CPU(2.5V)upto100MHz.

- 7 PCI(3.3V) @ 33.3MHz (Includes one free running).

-2REFclksFixed(3.3V)48MHzat14.318MHz.

Skew characteristics:

Spread spectrum may be enabled by driving pin 26, SPREAD#

active (Low) at power-on. Spread spectrum typically reduces

system EMI by 8dB to 10dB. This simplifies EMI qualification

without resorting to board design iterations or costly shielding.

The ICS9248-61 employs a proprietary closed loop design,

which tightly controls the percentage of spreading over

process and temperature variations.

-CPUCPU<175ps

- PCI PCI < 250ps

- PCI_E (early) PCI = 2.1ns

- CPU(early) PCI = 1.5ns 4ns

Supports Spread Spectrum modulation for CPU and PCI

clocks, 0.5% down spread

Efficient Power management scheme through stop clocks

and power down modes.

Uses external 14.318MHz crystal, no external load cap

required for CL=18pF crystal.

28pin209milSSOP.

Block Diagram

Pin Configuration

28 pin SSOP

Power Groups

GNDR/C=REFCLK,CORE,Crystal

VDDCOR=Core

GNDLCPU,VDDCPU=CPU

GND48,VDD48=48MHz

VDDPCI,GNDPCI-PCICLK,PCICLK_F,PCICLK_E

Pentium is a trademark on Intel Corporation.

9248-61RevB1/8/99

ICS reserves the right to make changes in the device data identified in

this publication without further notice. ICS advises its customers to

obtain the latest version of all device data to verify that any

information being relied upon by the customer is current and accurate.

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