40002A01 datasheet(1/12 Pages) ICST

Part #	40002A01

Description	FEMTOCLOCKS??CRYSTAL-TO LVCMOS/LVTTL FREQUENCY SYNTHESIZER

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Manufacturer	ICST [Integrated Circuit Systems]

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Integrated

Circuit

Systems, Inc.

840002AG-01

www.icst.com/products/hiperclocks.html

REV. B JANUARY 13, 2006

1

ICS840002-01

FEMTOCLOCKS™CRYSTAL-TO-

LVCMOS/LVTTL FREQUENCY SYNTHESIZER

GENERAL DESCRIPTION

The ICS840002-01 is a 2 output LVCMOS/LVTTL

Synthesizer optimized to generate Ethernet

reference clock frequencies and is a member of

the HiPerClocksTM family of high performance

clock solutions from ICS. Using a 25MHz 18pF

parallel resonant crystal, the following frequencies can be

generated based on the 2 frequency select pins (F_SEL1:0):

156.25MHz, 125MHz, and 62.5MHz. The ICS840002-01 uses

ICS’ 3rd generation low phase noise VCO technology and can

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

meeting Ethernet jitter requirements. The ICS840002-01 is

packaged in a small 16-pin TSSOP package.

HiPerClockS™

ICS

BLOCK DIAGRAM

PIN ASSIGNMENT

F_SEL0

nXTAL_SEL

TEST_CLK

OE

MR

nPLL_SEL

VDDA

VDD

1

2

3

4

5

6

7

8

16

15

14

13

12

11

10

9

F_SEL1

GND

Q0

Q1

VDDO

XTAL_IN

XTAL_OUT

ICS840002-01

16-Lead TSSOP

4.4mm x 5.0mm x 0.92mm

package body

G Package

Top View

FEATURES

• Two LVCMOS/LVTTL outputs @ 3.3V,

17

Ω typical output impedance

• Selectable crystal oscillator interface

or LVCMOS/LVTTL single-ended input

• Output frequency range: 56MHz - 175MHz

• VCO range: 560MHz - 700MHz

• Output skew: 12ps (maximum)

• RMS phase jitter at 156.25MHZ (1.875MHz - 20MHz):

0.47ps (typical)

Phase noise:

Offset

Noise Power

100Hz ............... -97.4 dBc/Hz

1

kHz .............. -120.2 dBc/Hz

10

kHz .............. -127.6 dBc/Hz

100

kHz .............. -126.1 dBc/Hz

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

• -30°C to 85°C ambient operating temperature

• Available in both standard and lead-free RoHS compliant

packages

Q0

Q1

OE

F_SEL1:0

nPLL_SEL

nXTAL_SEL

XTAL_IN

XTAL_OUT

TEST_CLK

MR

OSC

Phase

Detector

VCO

M = ÷25 (fixed)

F_SEL1:0

0 0 ÷4

0 1 ÷5

1 0 ÷10

1 1 ÷5

0

1

0

2

N

25MHz

Pullup

Pulldown

Pullup:Pullup

Pulldown

FREQUENCY SELECT FUNCTION TABLE

s

t

u

p

n

I

y

c

n

e

u

q

e

r

F

t

u

p

t

u

O

)

.

f

e

R

z

H

M

5

2

(

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

N

00

5

24

5

2

.

6

5

1

01

5

25

5

2

1

10

5

20

15

.

2

6

11

5

25

5

2

1

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