Integrated

Circuit

Systems, Inc.

840002AGI

www.icst.com/products/hiperclocks.html

REV. A MARCH 10, 2005

1

ICS840002I

The ICS840002I is a 2 output LVCMOS/LVTTL

Synthesizer optimized to generate Fibre Channel

reference clock frequencies and is a member of

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_SEL1:0):

212.5MHz, 159.375MHz, 156.25MHz, 106.25MHz, and

noise VCO technology and can achieve 1ps or lower typical

rms phase jitter, easily meeting Fibre Channel jitter requirements.

The ICS840002I is packaged in a 16-pin TSSOP package.

HiPerClockS™

ICS

F_SEL0

nXTAL_SEL

TEST_CLK

OE

MR

nPLL_SEL

1

2

3

4

5

6

7

8

16

15

14

13

12

11

10

9

F_SEL1

GND

GND

Q0

Q1

XTAL_IN

XTAL_OUT

ICS840002I

16-Lead TSSOP

4.4mm x 5.0mm x 0.92mm

package body

G Package

Top View

• Two LVCMOS outputs @ 3.3V, 17

Ω typical output impedance

• Selectable crystal oscillator interface

or LVCMOS single-ended input

• Output frequency range: 46.66MHz - 233.33MHz

• VCO range: 560MHz - 700MHz

• Supports the following output frequencies: 212.5MHz,

159.375MHz, 156.25MHz, 106.25MHz and 53.125MHz

• RMS phase jitter @ 212.5MHz (637KHz - 10MHz):

0.83ps (typical)

Typical phase noise at 212.5MHz:

Offset

Noise Power

100Hz ............... -91.3 dBc/Hz

1KHz .............. -114.3 dBc/Hz

10KHz .............. -120.7 dBc/Hz

100KHz .............. -120.2 dBc/Hz

• Power supply modes:

Core/Output

3.3V/3.3V

3.3V/2.5V

2.5V/2.5V

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

• Lead-Free package RoHS compliant

Q0

Q1

OE

F_SEL1:0

nPLL_SEL

nXTAL_SEL

XTAL_IN

XTAL_OUT

TEST_CLK

MR

OSC

Phase

Detector

VCO

M = ÷24 (fixed)

F_SEL1:0

0 0 ÷3

0 1 ÷4

1 0 ÷6

0

1

1

0

2

N

26.5625MHz

Pullup

Pulldown

Pulldown

Pulldown

Pullup:Pullup

Pulldown

y

c

n

e

u

q

e

r

F

t

u

p

n

I

)

z

H

M

(

s

t

u

p

n

I

y

c

n

e

u

q

e

r

F

t

u

p

t

u

O

)

z

H

M

(

1

L

E

S

_

F0

L

E

S

_

Fe

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

o

i

t

a

R

N

/

M

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

6

6

1

4

0

.

6

20

1

4

24

6

5

2

.

6

5

1