ICS843002I datasheet(1/16 Pages) ICST

Part #	ICS843002I

Description	FEMTOCLOCKS-TM CRYSTAL-TO-3.3V, 2.5V LVPECL FREQUENCY SYNTHESIZER

PDF	16 Pages

Scroll/Zoom	100%

Manufacturer	ICST [Integrated Circuit Systems]

Direct Link	http://www.icst.com

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1 / 16 page

843002AGI

www.icst.com/products/hiperclocks.html

REV. A JANUARY 4, 2006

1

Integrated

Circuit

Systems, Inc.

ICS843002I

FEMTOCLOCKS™ CRYSTAL-TO-3.3V, 2.5V

LVPECL FREQUENCY SYNTHESIZER

GENERAL DESCRIPTION

The ICS843002I is a 2 output LVPECL synthesizer

optimized to generate Fibre Channel reference

clock frequencies and is a member of the

HiPerClocksTM family of high performance clock

solutions from ICS. Using a 26.5625MHz, 18pF

parallel resonant crystal, the following frequencies can be

generated based on the 2 frequency select pins (F_SEL[1:0]):

212.5MHz, 187.5MHz, 159.375MHz, 106.25MHz, and

53.125MHz. The ICS843002I uses ICS’ FemtoClockTM low

phase noise VCO technology and can achieve 1ps or lower

typical rms phase jitter, easily meeting Fibre Channel jitter

requirements. The ICS843002I is packaged in a small 20-pin

TSSOP package.

FEATURES

• Two 3.3V or 2.5V LVPECL outputs

• Selectable crystal oscillator interface

or LVCMOS/LVTTL single-ended input

• Supports the following output frequencies: 212.5MHz,

187.5MHz, 159.375MHz, 106.25MHz and 53.125MHz

• VCO range: 560MHz - 680MHz

• RMS phase jitter @212.5MHz (2.55MHz - 20MHz):

0.50ps (typical)

• Full 3.3V or 2.5V supply modes

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

• Available in both standard and lead-free RoHS compliant

packages

HiPerClockS™

ICS

PIN ASSIGNMENT

1

0

1

0

Phase

Detector

VCO

637.5MHz

(w/26.5625MHz

Reference)

OSC

M = 24 (fixed)

F_SEL[1:0]

0 0

÷3

0 1

÷4

1 0

÷6

1 1

÷12

2

ICS843002I

20-Lead TSSOP

6.5mm x 4.4mm x 0.92mm

package body

G Package

Top View

BLOCK DIAGRAM

FREQUENCY SELECT FUNCTION TABLE

F_SEL[1:0]

nPLL_SEL

REF_CLK

XTAL_IN

XTAL_OUT

nXTAL_SEL

MR

Q0

nQ0

Q1

nQ1

Pulldown

26.5625MHz

nc

VCCO

Q0

nQ0

MR

nPLL_SEL

nc

VCCA

F_SEL0

VCC

1

2

3

4

5

6

7

8

9

10

20

19

18

17

16

15

14

13

12

11

VCCO

Q1

nQ1

VEE

VCC

nXTAL_SEL

REF_CLK

XTAL_IN

XTAL_OUT

F_SEL1

Pulldown

s

t

u

p

n

I

t

u

p

t

u

O

y

c

n

e

u

q

e

r

F

)

z

H

M

(

t

u

p

n

I

y

c

n

e

u

q

e

r

F

1

L

E

S

_

F0

L

E

S

_

F

r

e

d

i

v

i

D

M

e

u

l

a

V

r

e

d

i

v

i

D

N

e

u

l

a

V

N

/

M

e

u

l

a

V

r

e

d

i

v

i

D

5

2

6

5

.

6

20

0

4

23

8

5

.

2

1

2

5

2

6

5

.

6

20

1

4

24

6

5

7

3

.

9

5

1

5

2

6

5

.

6

21

0

4

26

4

5

2

.

6

0

1

5

2

6

5

.

6

21

1

4

22

12

5

2

1

.

3

5

7

3

4

.

3

20

0

4

23

8

5

.

7

8

1

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