Datasheet > ICS9248YG-PPP-T

ICS9248YG-PPP-T

更新时间： 2024-09-26 10:37:11

品牌	Logo	应用领域
艾迪悌 - IDT		光电二极管
页数	文件大小	规格书
11页	308K
描述
Processor Specific Clock Generator, 100MHz, PDSO28, 6.10 MM, 0.65 MM PITCH, TSSOP-28

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ICS9248YG-PPP-T 数据手册

Integrated

Circuit

Systems, Incꢀ

ICS9248-50

Frequency Timing Generator for Pentium II Systems

General Description

Features

•

Generates the following system clocks:

The ICS9248-50 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.

- 2 CPU (2.5V) up to 100MHz.

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

- 2 REF clks (3.3V) at 14.318MHz.

Skew characteristics:

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

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

systemEMIby8dBto10dB. ThissimplifiesEMIqualification

without resorting to board design iterations or costly shielding.

The ICS9248-50 employs a proprietary closed loop design,

which tightly controls the percentage of spreading over

process and temperature variations.

•

- CPU – CPU<175ps

- PCI – PCI < 500ps

- 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.

28-pin (209 mil) SSOP and (6.1mm) TSSOP package

Block Diagram

Pin Configuration

28-Pin SSOP & TSSOP

Power Groups

VDD, GND=PLLcore

VDDREF, GNDREF = REF(0:1), X1, X2

VDDPCI, GNDPCI=PCICLK_F, PCICLK(0:4)

VDD48, GND48 = 48MHz, 48/24MHz

Pentium is a trademark on Intel Corporation.

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

9248-50 Rev - G 10/16/00

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

12 3 4 5 6 7...11

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