ICS843004AI01 datasheet(9/14 Pages) ICST

9 / 14 page

843004AGI-01

www.icst.com/products/hiperclocks.html

REV. A FEBRUARY 11, 2005

Integrated

Circuit

Systems, Inc.

ICS843004I-01

FEMTOCLOCKS™CRYSTAL-TO-

3.3V, 2.5V LVPECL FREQUENCY SYNTHESIZER

VCC=3.3V

VDD

Zo = 50 Ohm

18pF

133

RD1

Not Install

To Logic

Input

pins

VCC

Zo = 50 Ohm

RU2

Not Install

3.3V

133

ICS843004-01

VCC

10uF

133

0.1u

25MHz

Zo = 50 Ohm

133

3.3V

VDD

82.5

VCCA

0.01u

0.1u

VCCO=3.3V

Logic Control Input Examples

0.1u

33pF

0.1u

RU1

82.5

Set Logic

Input to

'1'

27pF

To Logic

Input

pins

R10

82.5

Zo = 50 Ohm

82.5

Set Logic

Input to

'0'

VCCO

RD2

LAYOUT GUIDELINE

Figure 5 shows a schematic example of the ICS843004I-01. An

example of LVEPCL termination is shown in this schematic. Ad-

ditional LVPECL termination approaches are shown in the

LVPECL Termination Application Note. In this example, an 18pF

FIGURE 5. ICS843004I-01 SCHEMATIC EXAMPLE

parallel resonant 25MHz crystal is used. The C1=27pF and

C2=33pF are recommended for frequency accuracy. For differ-

ent board layout, the C1 and C2 may be slightly adjusted for

optimizing frequency accuracy.

ICS843004I-01

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