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ICS844246AGLF

FEMTOCLOCKS™ CRYSTAL-TO-LVDS FREQUENCY SYNTHESIZER W/INTEGRATED FANOUT BUFFER

Integrated Circuit Systems 

Integrated

Circuit

Systems, Inc.

PRELIMINARY

ICS844246

FEMTOCLOCKS™ CRYSTAL-TO-LVDS

FREQUENCY SYNTHESIZER W/INTEGRATED FANOUT BUFFER

GENERAL DESCRIPTION

The ICS844246 is a Crystal-to-LVDS Clock

ICS

Synthesizer/Fanout Buffer designed for Fibre

HiPerClockS™ Channel and Gigabit Ethernet applications and

is a member of the HiperClockS™ family of

High Performance Clock Solutions from ICS.

The output frequency can be set using the frequency

select pins and a 25MHz crystal for Ethernet fre-

quencies, or a 26.5625MHz crystal for a Fibre Channel.

The low phase noise characteristics of the ICS844246

make it an ideal clock for these demanding applications.

FEATURES

• Six LVDS outputs

• Crystal oscillator interface

• Output frequency range: 53.125MHz to 333.3333MHz

• Crystal input frequency range: 25MHz to 33.333MHz

• RMS phase jitter at 125MHz, using a 25MHz crystal

(1.875MHz to 20MHz): 0.39ps (typical)

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

• 0°C to 70°C ambient operating temperature

• Industrial temperature information available upon request

SELECT FUNCTION TABLE

Inputs

FB_SEL N_SEL1 N_SEL0

0

0

0

0

0

1

0

1

0

0

1

1

1

0

0

1

0

1

1

1

0

1

1

1

M Divide

20

20

20

20

24

24

24

24

Function

N Divide

2

4

5

8

3

4

6

12

• Available in both standard and lead-free RoHS-compliant

packages

M/N

10

5

4

2.5

8

6

4

2

BLOCK DIAGRAM

PIN ASSIGNMENT

PLL_BYPASS Pullup

XTAL_IN

XTAL_OUT

OSC

1

Output

PLL

0

Divider

Q0

nQ0

Q1

nQ1

Q2

nQ2

VDDO 1

VDDO 2

nQ2 3

Q2 4

nQ1 5

Q1 6

nQ0 7

Q0 8

PLL_BYPASS 9

VDDA 10

VDD 11

FB_SEL 12

24 Q3

23 nQ3

22 Q4

21 nQ4

20 Q5

19 nQ5

18 N_SEL1

17 GND

16 GND

15 N_SEL0

14 XTAL_OUT

13 XTAL_IN

Feedback

Q3

ICS843246

24-Lead, 300-MIL SOIC

Divider

nQ3

7.5mm x 15.33mm x 2.3mm

body package

FB_SEL Pulldown

Q4

M Package

Top View

N_SEL1 Pullup

nQ4

24-Lead TSSOP

Pullup

N_SEL0

4.40mm x 7.8mm x 0.92mm

Q5

body package

nQ5

G Package

Top View

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.

844246AM

www.icst.com/products/hiperclocks.html

REV. A SEPTEMBER 29, 2005

1

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