Datasheet > ICS8431AM-21

ICS8431AM-21

更新时间： 2024-11-02 21:55:31

品牌	Logo	应用领域
矽成 - ICSI		振荡器晶体振荡器外围集成电路光电二极管时钟
页数	文件大小	规格书
17页	222K
描述
350MHZ, LOW JITTER, CRYSTAL OSCILLATOR-TO-3.3V LVPECL FREQUENCY SYNTHESIZER

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ICS8431AM-21 数据手册

ICS8431-21

350MHZ, LOW JITTER, CRYSTAL OSCILLATOR-

TO-3.3V LVPECL FREQUENCY SYNTHESIZER

Integrated

Circuit

Systems, Inc.

GENERAL DESCRIPTION

FEATURES

• Fully integrated PLL

The ICS8431-21 is a general purpose clock fre-

ICS

quency synthesizer for IA64/32 application and a

member of the HiPerClockS™ family of High Per-

formance Clock Solutions from ICS.The VCO op-

erates at a frequency range of 250MHz to 700MHz

• Differential 3.3V LVPECL output

HiPerClockS™

• Crystal oscillator interface

• Output frequency range: 62.5MHz to 350MHz

• Crystal input frequency range: 14MHz to 25MHz

• VCO range: 250MHz to 700MHz

providing an output frequency range of 62.5MHz to 350MHz.

The output frequency can be programmed using the parallel in-

terface, M0 through M8 to the configuration logic, and the output

divider control pin, DIV_SEL. Spread spectrum clocking is pro-

grammed via the control inputs SSC_CTL0 and SSC_CTL1.

• Programmable PLL loop divider for generating a variety

of output frequencies

Programmable features of the ICS8431-21 support four op-

erational modes.The four modes are spread spectrum clock-

ing (SSC), non-spread spectrum clock and two test modes

which are controlled by the SSC_CTL[1:0] pins. Unlike other

synthesizers, the ICS8431-21 can immediately change

spread-spectrum operation without having to reset the device.

• Spread Spectrum Clocking (SSC) fixed at 1/2% modulation

for environments requiring ultra low EMI

• PLL bypass modes supporting in-circuit testing and on-chip

functional block characterization

• Cycle-to-cycle jitter: 30ps (maximum)

• 3.3V supply voltage

In SSC mode, the output clock is modulated in order to achieve

a reduction in EMI. In one of the PLL bypass test modes, the

PLL is disconnected as the source to the differential output

allowing an external source to be connected to the TEST_I/O

pin.This is useful for in-circuit testing and allows the differen-

tial output to be driven at a lower frequency throughout the

system clock tree. In the other PLL bypass mode, the oscilla-

tor divider is used as the source to both the M and the Fout

divide by 2.This is useful for characterizing the oscillator and

internal dividers.

• 0°C to 85°C ambient operating temperature

• Replaces ICS8431-01 and ICS8431-11

• Lead-Free package fully RoHS compliant

BLOCK DIAGRAM

PIN ASSIGNMENT

nP_LOAD

V^CC

XTAL_IN

XTAL_OUT

V^CCA

VEE

DIV_SEL

V^CCO

FOUT

nFOUT

V^EE

XTAL_IN

OSC

XTAL_OUT

÷ 16

PLL

PHASE

DETECTOR

SSC_CTL0

SSC_CTL1

V^EE

TEST_I/O

V^CC

÷2

VCO

÷4

FOUT

nFOUT

÷ M

ICS8431-21

28-Lead SOIC

TEST_I/O

7.5mm x 18.05mm x 2.25mm package body

M Package

TopView

SSC

Control

Logic

Configuration

Logic

M0:M8

nP_LOAD

SSC_CTL0

SSC_CTL1

DIV_SEL

8431AM-21

www.icst.com/products/hiperclocks.html

REV. A APRIL 27, 2005

12 3 4 5 6 7...17

中文翻译

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与ICS8431AM-21相关器件

型号	品牌	获取价格	描述	数据表
ICS8431AM-21LF	ICSI	获取价格	350MHZ, LOW JITTER, CRYSTAL OSCILLATOR-TO-3.3V LVPECL FREQUENCY SYNTHESIZER
ICS8431AM-21LFT	ICSI	获取价格	350MHZ, LOW JITTER, CRYSTAL OSCILLATOR-TO-3.3V LVPECL FREQUENCY SYNTHESIZER
ICS8431AM-21T	ICSI	获取价格	350MHZ, LOW JITTER, CRYSTAL OSCILLATOR-TO-3.3V LVPECL FREQUENCY SYNTHESIZER
ICS8431AMI-21	ICSI	获取价格	350MHZ, LOW JITTER, CRYSTAL OSCILLATOR-TO-3.3V LVPECL FREQUENCY SYNTHESIZER
ICS8431AMI-21LF	ICSI	获取价格	350MHZ, LOW JITTER, CRYSTAL OSCILLATOR-TO-3.3V LVPECL FREQUENCY SYNTHESIZER
ICS8431AMI-21LFT	ICSI	获取价格	350MHZ, LOW JITTER, CRYSTAL OSCILLATOR-TO-3.3V LVPECL FREQUENCY SYNTHESIZER
ICS8431AMI-21T	ICSI	获取价格	350MHZ, LOW JITTER, CRYSTAL OSCILLATOR-TO-3.3V LVPECL FREQUENCY SYNTHESIZER
ICS8431CM-01	ICSI	获取价格	200MHZ, LOW JITTER, LVPECL FREQUENCY SYNTHESIZER
ICS8431CM-01LFT	IDT	获取价格	Clock Generator, 200MHz, PDSO28, 7.5 X 18.05 MM, 2.25 MM HEIGHT, MS-013, MO-119, SOIC-28
ICS8431CM-01T	ICSI	获取价格	200MHZ, LOW JITTER, LVPECL FREQUENCY SYNTHESIZER

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