ICS87608AYIT datasheet(8/12 Pages) ETC

Part #	ICS87608AYIT

Description	LOW VOLTAGE/LOW SKEW, 1:8 PCI/PCI-X ZERO DELAY CLOCK GENERATOR

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Manufacturer	ETC [List of Unclassifed Manufacturers]

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87608AYI

www.icst.com/products/hiperclocks.html

REV. B MARCH 11, 2005

8

Integrated

Circuit

Systems, Inc.

ICS87608I

LOW VOLTAGE/LOW SKEW, 1:8 PCI/PCI-X

ZERO DELAY CLOCK GENERATOR

APPLICATION INFORMATION

As in any high speed analog circuitry, the power supply pins

are vulnerable to random noise. The ICS87608I provides sepa-

rate power supplies to isolate any high switching

noise from the outputs to the internal PLL. V

DD, VDDA, and VDDOX

should be individually connected to the power supply

plane through vias, and bypass capacitors should be

used for each pin. To achieve optimum jitter performance,

power supply isolation is required.

Figure 1 illustrates how

a 10

Ω resistor along with a 10µF and a .01μF bypass

capacitor should be connected to each V

DDA.

POWER SUPPLY FILTERING TECHNIQUES

FIGURE 1. POWER SUPPLY FILTERING

10

Ω

V

DDA

10

μF

.01

μF

3.3V

.01

μF

V

DD

CRYSTAL INPUT INTERFACE

The ICS87608I has been characterized with 18pF parallel

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

Figure 2 below were determined using a 25MHz, 18pF parallel

Figure 2. CRYSTAL INPUt INTERFACE

resonant crystal and were chosen to minimize the frequency

ppm error. The optimum C1 and C2 values can be slightly ad-

justed for optimum frequency accuracy.

C1

22p

X1

18pF Parallel Cry stal

C2

22p

XTAL2

XTAL1

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ICS87608AYIT Datasheet(PDF) 8 Page - List of Unclassifed Manufacturers

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