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ICS8442I Datasheet, PDF (8/15 Pages) Integrated Circuit Systems – 700MHZ, CRYSTAL OSCILLATOR-TO-DIFFERENTIAL LVDS FREQUENCY SYNTHESIZER
◁
Integrated
Circuit
Systems, Inc.
ICS8442I
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 ICS8442I to gen-
erate 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)
ICS8442I
Output Frequency
to SERDES
(MHz)
25
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
ICS8442I
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 ICS8442I provides sepa-
rate power supplies to isolate any high switching noise from
the outputs to the internal PLL. V and V , should
DD
DDA
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 V pin.
DDA
3.3V
V
DD
.01μF 10Ω
VDDA
.01μF
10μF
FIGURE 2. POWER SUPPLY FILTERING
8442AYI
www.icst.com/products/hiperclocks.html
REV. C MAY 10, 2005
8
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