ICS8442 데이터 시트보기 (PDF) - Integrated Circuit Systems

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ICS8442

700MHZ, CRYSTAL OSCILLATOR-TO-DIFFERENTIAL LVDS FREQUENCY SYNTHESIZER

Integrated Circuit Systems 

Integrated

Circuit

Systems, Inc.

ICS8442

700MHZ, CRYSTAL OSCILLATOR-TO-DIFFERENTIAL

LVDS FREQUENCY SYNTHESIZER

APPLICATION INFORMATION

STORAGE AREA NETWORKS

A variety of technologies are used for interconnection of the

elements within a SAN. The tables below lists the common fre-

quencies used as well as the settings for the ICS8442 to gener-

ate the appropriate frequency.

Table 8. Common SANs Application Frequencies

Interconnect Technology

Gigabit Ethernet

Fibre Channel

Infiniband

Clock Rate

1.25 GHz

FC1 1.0625 GHz

FC2 2.1250 GHz

2.5 GHz

Reference Frequency to SERDES

(MHz)

125, 250, 156.25

106.25, 53.125, 132.8125

125, 250

Crystal Frequency

(MHz)

25, 19.53125

16.6015625, 25

25

Table 9. Configuration Details for SANs Applications

Interconnect

Technology

Crystal Frequency

(MHz)

25

ICS8442

Output Frequency

to SERDES

(MHz)

125

25

Gigabit Ethernet

25

250

156.25

19.53125

156.25

25

Fiber Channel 1

25

53.125

106.25

Fiber Channel 2

16.6015625

132.8125

25

125

Infiniband

25

250

ICS8442

M & N Settings

M8 M7 M6 M5 M4 M3 M2 M1 M0 N1 N0

0 0 0 0 10 10 0 10

0 0 0 0 10 10 0 0 1

0 0 0 0 1 10 0 1 10

0 0 0 10 0 0 0 0 10

0 0 0 0 10 0 0 1 1 1

0 0 0 0 10 0 0 1 10

0 0 0 10 0 0 0 0 10

0 0 0 0 10 10 0 10

0 0 0 0 10 10 0 0 1

POWER SUPPLY FILTERING TECHNIQUES

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

are vulnerable to random noise. The ICS8442 provides sepa-

rate power supplies to isolate any high switching noise from

the outputs to the internal PLL. VDD and VDDA, 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, better power supply

isolation is required. Figure 2 illustrates how a 10Ω along

|with a 10µF and a .01µF bypass capacitor should be

connected to each VDDA pin.

3.3V

VDD

.01µF 10Ω

VDDA

.01µF

10µF

FIGURE 2. POWER SUPPLY FILTERING

8442AY

www.icst.com/products/hiperclocks.html

REV. C JULY 8, 2004

8

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