ICS843081AGI-01 datasheet(8/15 Pages) ICST

Part #	ICS843081AGI-01

Description	FEMTOCLOCKS??CRYSTAL-TO-3.3V, 2.5V LVPECL CLOCK MULTIPLIER

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Manufacturer	ICST [Integrated Circuit Systems]

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8 / 15 page

843081AGI-01

www.icst.com/products/hiperclocks.html

REV. B JANUARY 23, 2006

8

Integrated

Circuit

Systems, Inc.

ICS843081I-01

FEMTOCLOCKS™CRYSTAL-TO-

3.3V, 2.5V LVPECL CLOCK MULTIPLIER

TERMINATION FOR 3.3V LVPECL OUTPUT

The clock layout topology shown below is a typical termina-

tion for LVPECL outputs. The two different layouts mentioned

are recommended only as guidelines.

FOUT and nFOUT are low impedance follower outputs that

generate ECL/LVPECL compatible outputs. Therefore, termi-

nating resistors (DC current path to ground) or current sources

must be used for functionality. These outputs are designed

FIGURE 3B. LVPECL OUTPUT TERMINATION

FIGURE 3A. LVPECL OUTPUT TERMINATION

to drive 50

Ω transmission lines. Matched impedance tech-

niques should be used to maximize operating frequency and

minimize signal distortion. Figures 3A and 3B show two dif-

ferent layouts which are recommended only as guidelines.

Other suitable clock layouts may exist and it would be rec-

ommended that the board designers simulate to guarantee

compatibility across all printed circuit and clock component

process variations.

V

CC - 2V

50

Ω

50

Ω

RTT

Z

o = 50Ω

Z

o = 50Ω

FOUT

FIN

RTT =

Z

o

1

((V

OH + VOL) / (VCC – 2)) – 2

3.3V

125

Ω

125

Ω

84

Ω

84

Ω

Z

o = 50Ω

Z

o = 50Ω

FOUT

FIN

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