ICS840051 datasheet(1/10 Pages) ICST

Part #	ICS840051

Description	FEMTOCLOCK CRYSTAL-TOLVCMOS/LVTTL CLOCK GENERATOR

PDF	10 Pages

Scroll/Zoom	100%

Manufacturer	ICST [Integrated Circuit Systems]

Direct Link	http://www.icst.com

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1 / 10 page

840051AG

www.icst.com/products/hiperclocks.html

REV. A JANUARY 14, 2005

1

Integrated

Circuit

Systems, Inc.

ICS840051

FEMTOCLOCKS™CRYSTAL-TO-

LVCMOS/LVTTL CLOCK GENERATOR

GENERAL DESCRIPTION

The ICS840051 is a Gigabit Ethernet Clock

Generator and a member of the HiPerClocksTM

family of high performance devices from ICS.

The ICS840051 can synthesize 10 Gigabit

Ethernet, SONET, or Serial ATA reference clock

frequencies with the appropriate choice of crystal and

output divider. The ICS840051 has excellent phase jitter

performance and is packaged in a small 8-pin TSSOP,

making it ideal for use in systems with limited board space.

FEATURES

• 1 LVCMOS/LVTTL output, 15Ω output impedance

• Crystal oscillator interface designed for

18pF parallel resonant crystals

• Output frequency range: 70MHz - 170MHz

• VCO range: 560MHz - 680MHz

• RMS phase jitter at 155.52MHz (1.875MHz - 20MHz):

0.48ps (typical)

• RMS phase noise at 155.52MHz

Offset Noise Power

100Hz ............... -99.7 dBc/Hz

1KHz ................ -120 dBc/Hz

10KHz ................ -128 dBc/Hz

100KHz ................ -127 dBc/Hz

• 3.3V operating supply

• 0°C to 70°C ambient operating temperature

• Lead-Free fully RoHS compliant

• Industrial temperature information available upon request

HiPerClockS™

ICS

ICS840051

8-Lead TSSOP

4.40mm x 3.0mm x 0.925mm

package body

G Package

Top View

VDDA

OE

XTAL_OUT

XTAL_IN

1

2

3

4

VDD

Q0

GND

FREQ_SEL

8

7

6

5

BLOCK DIAGRAM

OSC

Phase

Detector

VCO

560MHz-680MHz

0 ÷4 (default)

1 ÷8

÷32

(fixed)

XTAL_IN

XTAL_OUT

Q0

FREQUENCY TABLE

s

t

u

p

n

I

y

c

n

e

u

q

e

r

F

t

u

p

t

u

O

)

z

H

M

(

)

z

H

M

(

y

c

n

e

u

q

e

r

F

l

a

t

s

y

r

CL

E

S

_

Q

E

R

F

1

0

6

1

4

1

.

0

20

2

1

8

2

3

1

.

1

6

1

0

6

1

4

1

.

0

21

6

0

4

6

5

.

0

8

5

2

1

3

5

.

9

10

5

2

.

6

5

1

5

2

1

3

5

.

9

11

5

2

1

.

8

7

4

.

9

10

2

5

.

5

1

4

.

9

11

6

7

.

7

5

7

.

8

10

0

5

1

5

7

.

8

11

5

7

PIN ASSIGNMENT

OE

FREQ_SEL

Pullup

Pulldown

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