Integrated

Circuit

Systems, Inc.

840004AG

www.icst.com/products/hiperclocks.html

REV. A SEPTEMBER 16, 2004

1

ICS840004

PRELIMINARY

The ICS840004 is a 4 output LVCMOS/LVTTL

Synthesizer optimized to generate Ethernet

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

random rms phase jitter, easily meeting Ethernet jitter

requirements. The ICS840004 is packaged in a small 20-pin

TSSOP package.

HiPerClockS™

ICS

• Four LVCMOS/LVTTL outputs, 15

Ω typical output impedance

• Selectable crystal oscillator interface

or LVCMOS single-ended input

• Supports the following input frequencies:

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

53.125MHz

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

0.98ps typical

• RMS phase noise at 212.5MHz, V

Phase noise:

Offset

Noise Power

100Hz ............... -88.8 dBc/Hz

1KHz .............. -109.0 dBc/Hz

10KHz .............. -116.1 dBc/Hz

100KHz .............. -117.5 dBc/Hz

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

• 0°C to 70°C ambient operating temperature

Q0

Q1

Q2

Q3

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 1 ÷12

0

1

1

0

2

N

26.5625MHz

Pullup

Pulldown

Pulldown

Pulldown

Pulldown:Pulldown

Pulldown

ICS840004

20-Lead TSSOP

6.5mm x 4.4mm x 0.92mm

package body

G Package

Top View

F_SEL0

nc

nXTAL_SEL

TEST_CLK

OE

MR

nPLL_SEL

nc

1

2

3

4

5

6

7

8

9

10

20

19

18

17

16

15

14

13

12

11

F_SEL1

GND

Q0

Q1

Q2

Q3

GND

XTAL_IN

XTAL_OUT

s

t

u

p

n

I

t

u

p

t

u

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y

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u

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u

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q

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r

F

1

L

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S

_

F0

L

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S

_

F

r

e

d

i

v

i

D

M

e

u

l

a

V

r

e

d

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v

i

D

N

e

u

l

a

V

N

/

M

e

u

l

a

V

o

i

t

a

R

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

The Preliminary Information presented herein represents a product in prototyping or pre-production. The noted characteristics are based on initial

product characterization. Integrated Circuit Systems, Incorporated (ICS) reserves the right to change any circuitry or specifications without notice.