Datasheet > ICS9250-13

ICS9250-13

更新时间： 2024-11-12 22:55:27

品牌	Logo	应用领域
矽成 - ICSI		/
页数	文件大小	规格书
15页	564K
描述
Frequency Generator & Integrated Buffers for PENTIUM/ProTM

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数据手册

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ICS9250-13 数据手册

Integrated

Circuit

Systems, Inc.

ICS9250-13

Frequency Generator & Integrated Buffers for PENTIUM/Pro^TM

General Description

Features

3.3Voutputs:SDRAM, PCI, REF, 48/24MHz

2.5Vor3.3Voutputs:CPU

The ICS9250-13 generates all clocks required for high speed

RISCorCISCmicroprocessorsystemssuchasIntel PentiumPro

orCyrix. Eightdifferentreferencefrequencymultiplyingfactors

are externally selectable with smooth frequency transitions.

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.

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.

No external load cap for C_L=18pF crystals

±250 ps CPU, PCI clock skew

400ps (cycle to cycle) CPU jitter

Smooth frequency switch, with selections from

50to83.3MHzCPU.

I²C interface for programming

2ms power up clock stable time

Clock duty cycle 45-55%.

56pin300milSSOPpackage

3.3V operation, 5V tolerant input.

Block Diagram

Recomended Application:

440LX/EX type chipset Motherboard single chip

clock solution.

Pin Configuration

Power Groups

56-Pin SSOP

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

VDDPCI=PCICLK_F,PCICLK(0:5)

VDDSDR=SDRAM(0:11), supplyforPLLcore,

VDD48=24MHz,48MHz

* Internal Pull-up Resistor of

120K to VDD on indicated inputs

VDDLIOAPIC=IOAPIC

VDDL2CPU= CPUCLK(0:3)

Pentium is a trademark of Intel Corporation

I²C is a trademark of Philips 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

9250-13RevA3/25/99

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

12 3 4 5 6 7...15

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