ICS8535AG-31LFT datasheet(8/14 Pages) ICST

Part #	ICS8535AG-31LFT

Description	LOW SKEW, 1-TO-4, CRYSTAL OSCILLATOR/ LVCMOS-TO-3.3V LVPECL FANOUT BUFFER

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Manufacturer	ICST [Integrated Circuit Systems]

Direct Link	http://www.icst.com

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8 / 14 page

8535AG-31

www.icst.com/products/hiperclocks.html

REV. B APRIL 29, 2005

8

Integrated

Circuit

Systems, Inc.

ICS8535-31

LOW SKEW, 1-TO-4, CRYSTAL OSCILLATOR/

LVCMOS-TO-3.3V LVPECL FANOUT BUFFER

APPLICATION INFORMATION

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

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 gen-

erate ECL/LVPECL compatible outputs. Therefore, terminating

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

be used for functionality. These outputs are designed to drive

50

Ω transmission lines. Matched impedance techniques should

be used to maximize operating frequency and minimize signal

distortion.

Figures 2A and 2B show two different layouts which

are recommended only as guidelines. Other suitable clock lay-

outs may exist and it would be recommended that the board

designers simulate to guarantee compatibility across all printed

circuit and clock component process variations.

TERMINATION FOR LVPECL OUTPUTS

FIGURE 2B. LVPECL OUTPUT TERMINATION

FIGURE 2A. LVPECL OUTPUT TERMINATION

Figure 3. CRYSTAL INPUt INTERFACE

CRYSTAL INPUT INTERFACE

The ICS8535-31 has been characterized with 18pF parallel

resonant crystals. The capacitor values, C1 and C2, shown

in

Figure 3 below were determined using an 18pF parallel reso-

nant crystal and were chosen to minimize the ppm error.

These same capacitor values will tune any 18pF parallel reso-

nant crystal over the frequency range and other parameters

specified in this data sheet. The optimum C1 and C2 values

can be slightly adjusted for different board layouts.

C1

18p

X1

18pF Parallel Crystal

C2

22p

XTAL_IN

XTAL_OUT

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ICS8535AG-31LFT Datasheet(PDF) 8 Page - Integrated Circuit Systems

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