Datasheet > ICS9248-72

ICS9248-72

更新时间： 2024-11-10 22:55:27

品牌	Logo	应用领域
矽成 - ICSI		/
页数	文件大小	规格书
12页	554K
描述
Frequency Timing Generator for PENTIUM II Systems

阅读下载

中文翻译

获取价格

数据手册

如果您发现信息不准确，欢迎纠错

ICS9248-72 数据手册

ICS9248-72

Integrated

Circuit

Systems, Inc.

Preliminary Product Preview

Frequency Timing Generator for PENTIUM II Systems

General Description

Features

The ICS9248-72 is a main clock synthesizer chip for Pentium

II based systems using Rambus Interface DRAMs. This chip

provides all the clocks required for such a system when used

with a Direct Rambus Clock Generator(DRCG) chip such as

theICS9211-01.

Up to 200MHz frequency support.

Power Down feature.

Spread Spectrum for EMI control

(0 to 0.5% down spread , + 0.25% center spread)

I²Cinterface.

Spread Spectrum may be enabled by driving the SPREAD#

pin active. Spread spectrum typically reduces system EMI by

8dBto10dB. ThissimplifiesEMIqualificationwithoutresorting

to board design iterations or costly shielding. The ICS9248-

72 employs a proprietary closed loop design, which tightly

controls the percentage of spreading over process and

temperature variations.

VDDL=2.5V,VDD=3.3V

Key Specification

CPU Output Jitter: <250ps

CPU/2 Output Jitter. <250ps

IOAPIC Output Jitter: <500ps

48MHz, 3V66, PCIOutputJitter:<500ps

Ref Output Jitter. <1000ps

CPUOutputSkew:<175ps

IOAPIC Output Skew <250ps

PCI Output Skew: <500ps

3V66OutputSkew<250ps

The CPU/2 clocks are inputs to the DRCG.

CPU to 3V66 Output Offset: 0.0 - 1.5ns (CPU leads)

3V66 to PCI Output Offset: 1.5 - 4.0ns (3V66 leads)

CPU to IOAPIC Output Offset 1.5 - 4.0ns (CPU leads)

Block Diagram

Pin Configuration

48-pin SSOP

* 250K ohm pull-up to VDD on indicated inputs.

1.These pins will have 2X drive strength

PRODUCT PREVIEW documents contain information on new

products in the sampling or preproduction phase of development.

Characteristic data and other specifications are subject to change

without notice.

9248-72RevB7/28/99

12 3 4 5 6 7...12

中文翻译

下载PDF

与ICS9248-72相关器件

型号	品牌	获取价格	描述	数据表
ICS9248-73	ICSI	获取价格	Frequency Timing Generator for Pentium II Systems
ICS9248-77	ICSI	获取价格	Frequency Timing Generator for PENTIUM II Systems
ICS9248-78	ICSI	获取价格	Frequency Timing Generator for Pentium II Systems
ICS9248-80	ICSI	获取价格	General Purpose 133MHz System Clock
ICS9248-81	ICSI	获取价格	Frequency Generator & Integrated Buffers
ICS9248-87	ICSI	获取价格	Frequency Generator & Integrated Buffers for
ICS9248-90	ICSI	获取价格	Frequency Generator & Integrated Buffers for PENTIUM/ProTM
ICS9248-92	ICSI	获取价格	Mobile Pentium IITM System Clock Chip
ICS9248-95	ICSI	获取价格	Frequency Generator & Integrated Buffers for PENTIUM/ProTM
ICS9248-96	ICSI	获取价格	Frequency Generator & Integrated Buffers for