FEMTOCLOCKS™ CRYSTAL-TO-3.3V, 2.5V LVPECL

75MHZ FREQUENCY SYNTHESIZER W/SSC

ICS843301I-108

1

ICS843301BGI-108 REV. A OCTOBER 9, 2007

PRELIMINARY

The ICS843301I-108 is a 75MHz Frequency

family of high perfor mance devices from IDT.

The ICS843301I-108 uses a 20MHz crystal to

synthesize 75MHz output. The device supports

0.5% downspread spread spectrum clocking. The ICS843301I-

108 has excellent <1ps phase jitter performance, over an

in a small 8-pin TSSOP, making it ideal for use in systems with

limited board space.

• One differential 3.3V or 2.5V LVPECL output

• Crystal oscillator interface designed for 20MHz,

18pF parallel resonant crystal

• Output frequency: 75MHz

• Supports SSC, 0.5% downspread

• RMS phase jitter @ 75MHz, using a 20MHz crystal

(900kHz - 7.5MHz): 0.73ps (typical)

• Full 3.3V or 2.5V operating supply

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

• Available in both standard (RoHS 5) and lead-free (RoHS 6)

packages

HiPerClockS™

ICS

XTAL_OUT

XTAL_IN

1

2

3

4

Q

nQ

SSC

8

7

6

5

OSC

Phase

Detector

VCO

600MHz

N Div

÷8

M Div

÷30

PLL

XTAL_IN

XTAL_OUT

Q

nQ

20MHz

t

u

p

n

I

e

d

o

M

C

S

S

)

t

l

u

a

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e

d

(

0f

f

O

C

S

S

1d

a

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r

p

s

n

w

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%

5

.

0

SSC

Pulldown

ICS843301I-108

8-Lead TSSOP

4.40mm x 3.0mm x 0.925mm package body

G Package

Top View

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

and/or qualification. Integrated Device Technology, Incorporated (IDT) reserves the right to change any circuitry or specifications without notice.