843004AG-125LF datasheet(1/14 Pages) IDT

Part #	843004AG-125LF

Description	FemtoClock??Crystal-to-3.3V LVPECL Frequency Synthesizer

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Manufacturer	IDT [Integrated Device Technology]

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ADVANCE INFORMATION

FemtoClock™ Crystal-to-3.3V

LVPECL Frequency Synthesizer

ICS843004-125

DATA SHEET

ICS843004AG-125 REVISION A JUNE 3, 2009

1

GENERAL DESCRIPTION

The ICS843004-125 is a 4 output LVPECL Syn-

thesizer optimized to generate Ethernet reference

clock frequencies and is a member of the

HiPerClocksTM family of high performance clock

solutions from IDT. The ICS843004-125 uses

IDT’s 3rd generation low phase noise VCO technology and can

achieve 1ps or lower typical rms phase jitter, easily meeting

Ethernet jitter requirements. The ICS843004-125 is packaged

in a small 24-pin TSSOP package.

FEATURES

• Four 3.3V LVPECL output pairs

• Selectable crystal oscillator interface

or LVCMOS/LVTTL single-ended input

• Crystal oscillator designed for 25MHz, 18pF parallel resonant

crystal

• Supports the following output frequency: 125MHz

• VCO range: 560MHz - 680MHz

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

(1.875MHz - 20MHz): 0.58ps (typical)

• Full 3.3V supply mode

• 0°C to 70°C ambient operating temperature

• Available in lead-free (RoHS 6) package

HiPerClockS™

ICS

PIN ASSIGNMENT

ICS843004-125

24-Lead TSSOP

4.40mm x 7.8mm x 0.925mm

package body

G Package

Top View

nQ1

Q1

VCCo

Q0

nQ0

MR

nPLL_SEL

nc

VCCA

nc

VCC

nc

1

2

3

4

5

6

7

8

9

10

11

12

nQ2

Q2

VCCO

Q3

nQ3

VEE

VCC

nXTAL_SEL

REF_CLK

VEE

XTAL_IN

XTAL_OUT

24

23

22

21

20

19

18

17

16

15

14

13

BLOCK DIAGRAM

s

t

u

p

n

I

)

z

H

M

(

y

c

n

e

u

q

e

r

F

t

u

p

t

u

O

)

.

f

e

R

z

H

M

5

2

(

e

u

l

a

V

r

e

d

i

v

i

D

Me

u

l

a

V

r

e

d

i

v

i

D

Ne

u

l

a

V

r

e

d

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i

D

N

/

M

5

25

5

2

1

FREQUENCY SELECT FUNCTION TABLE

1

0

1

0

Phase

Detector

VCO

625MHz

(w/25MHz

Reference)

OSC

M = 25 (fixed)

Q0

nQ0

Q1

nQ1

Q1

nQ1

Q2

nQ2

nQ3

Q3

nPLL_SEL

REF_CLK

XTAL_IN

XTAL_OUT

nXTAL_SEL

MR

Pulldown

25MHz

÷5

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843004AG-125LF Datasheet(PDF) 1 Page - Integrated Device Technology

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