845204AK

更新时间： 2024-01-07 18:18:31

品牌	Logo	应用领域
艾迪悌 - IDT		PC 时钟
页数	文件大小	规格书
13页	1102K
描述
CRYSTAL-TO-MLVDS PCI EXPRESS™ CLOCK SYNTHESIZER W/SPREAD SPECTRUM

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845204AK 数据手册

ADVANCE INFORMATION

CRYSTAL-TO-MLVDS PCI EXPRESS™

ICS845204

CLOCK SYNTHESIZER W/SPREAD SPECTRUM

General Description

Features

The ICS845204 is a 4 output PCI Express clock

• Four differential spread spectrum clock outputs

synthesizer optimized to generate low jitter PCI

Express™ reference clocks with or without spread

spectrum modulation and is a member of the

HiPerClockS™ family of high performance clock

• Each output can be individually disabled by separate

HiPerClockS™

output-enable inputs

• Crystal oscillator interface designed for 18pF,

25MHz parallel resonant crystal

solutions from IDT. Spread type and amount can be configured via

the SSC control pins. Using a 25MHz, 18pF parallel resonant

crystal, the device will generate M-LVDS clocks at either 25MHz,

100MHz, 125MHz or 250MHz. The ICS845204 uses a low jitter

VCO that easily meets PCI Express jitter requirements and is

packaged in a 32-pin VFQFN package.

• Supports the following output frequencies:

25MHz, 100MHz, 125MHz or 250MHz

• VCO range: 250MHz - 700MHz

• Supports SSC downspread at 0.05% and -0.75%, centerspread

at 0.25% and no spread options

• Cycle-to-cycle jitter: 50ps (maximum) design target

• Period jitter, RMS: TBD

Pin Assignment

• Full 3.3V output supply mode

• 0°C to 70°C ambient operating temperature

• Available in both standard (RoHS 5) and lead-free (RoHS 6)

packages

32 31 30 29 28 27 26 25

OE0

V^DD

nQ3

GND

V^DDO

nQ2

SSC1

FSEL0

GND

10 11 12 13 14 15 16

Block Diagram

ICS845204

0 0 PLL Bypass

32 Lead VFQFN

5mm x 5mm x 0.925mm

package body

25MHz

nQ0

XTAL_IN

Pullup

Phase

Detector

VCO

250-700MHz

OE0

OSC

0 1 ÷5

1 0 ÷4

1 1 ÷2

K Package

Top View

XTAL_OUT

nQ1

OE1

Pullup

Feedback Divider

÷20

nQ2

OE2

Pullup

Pullup:Pullup

Spread Spectrum

Control

SSC[1:0]

nQ3

OE3

Default = 100MHz

Pulldown:Pullup

FSEL[1:0]

The Advance Information presented herein represents a product that is developmental or prototype. The noted characteristics are design targets. Integrated

Device Technologies, Inc. (IDT) reserves the right to change any circuitry or specifications without notice.

IDT™ / ICS™ M-LVDS CLOCK SYNTHESIZER

ICS845204AK SEPTEMBER 25, 2007

12 3 4 5 6 7...13

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