Datasheet > 844256BGI

844256BGI

更新时间： 2023-05-15 00:00:00

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
16页	346K
描述
Clock Generator, PDSO24

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数据手册

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844256BGI 数据手册

FEMTOCLOCKS™ CRYSTAL-TO-LVDS

FREQUENCY SYNTHESIZER W/INTEGRATED FANOUT BUFFER

ICS844256I

GENERAL DESCRIPTION

FEATURES

The ICS844256I is a Crystal-to-LVDS Clock

• Six LVDS outputs

ICS

HiPerClockS™

Synthesizer/Fanout Buffer designed for SONET

and Gigabit Ethernet applications and is a

member of the HiperClockS™ family of High

Performance Clock Solutions from IDT. The

• Crystal oscillator interface

• Output frequency range: 62.5MHz to 625MHz

• Crystal input frequency range: 15.625MHz to 25.5MHz

output frequency can be set using the frequency select

pins and a 25MHz crystal for Ethernet frequencies, or a

19.44MHz crystal for SONET. The low phase noise character-

istics of the ICS844256I make it an ideal clock for these

demanding applications.

• RMS phase jitter at 125MHz, using a 25MHz crystal

(1.875MHz to 20MHz): 0.48ps (typical)

• Full 3.3V or 3.3V core, 2.5V output supply mode

• -40°C to 85°C ambient operating temperature

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

packages

SELECT FUNCTION TABLE

Inputs

Function

FB_SEL N_SEL1 N_SEL0 M Divide N Divide

M/N

12.5

6.25

BLOCK DIAGRAM

PIN ASSIGNMENT

DDO

nQ3

nQ0

nQ2

Pullup

PLL_BYPASS

nQ4

nQ1

nQ0

20 Q5

18 N_SEL1

nQ5

nQ1

Output

Divider

GND

XTAL_IN

PLL_BYPASS

GND

OSC

PLL

VDDA

N_SEL0

XTAL_OUT

XTAL_IN

XTAL_OUT

nQ2

FB_SEL

ICS844256I

24-Lead TSSOP, E-Pad

4.40mm x 7.8mm x 0.90mm

body package

Feedback

Divider

nQ3

Pulldown

FB_SEL

G Package

Top View

Pullup

nQ4

N_SEL1

Pullup

N_SEL0

nQ5

IDT^™/ ICS^™LVDS FREQUENCY SYNTHESIZER W/FANOUT BUFFER

ICS844256BGI REV. A DECEMBER 21, 2007

12 3 4 5 6 7...16

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