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SI5321 Datasheet, PDF (7/34 Pages) List of Unclassifed Manufacturers – SONET/SDH PRECISION CLOCK MULTIPLIER IC | |||
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Si5321
Table 3. AC Characteristics (Continued)
(VDD33 = 3.3 V ±5%, TA = â20 to 85 °C)
Parameter
Symbol
Test Condition
Min
Typ Max Unit
Input Clock Frequency (CLKIN)
FEC[2:0] = 110 (forward FEC)
INFRQSEL[2:0] = 001
INFRQSEL[2:0] = 010
INFRQSEL[2:0] = 011
INFRQSEL[2:0] = 100
INFRQSEL[2:0] = 101
INFRQSEL[2:0] = 110
fCLKIN
66/64 FEC Scaling
Minimum input frequency
is in the 155 MHz range
N/A
N/A
N/A
150.79
301.58
603.16
N/A
N/A
N/A
N/A MHz
N/A
N/A
â 168.22
â 336.44
â 672.88
Input Clock Frequency (CLKIN)
FEC[2:0] = 111 (reverse FEC)
INFRQSEL[2:0] = 001
INFRQSEL[2:0] = 010
INFRQSEL[2:0] = 011
INFRQSEL[2:0] = 100
INFRQSEL[2:0] = 101
INFRQSEL[2:0] = 110
fCLKIN
64/66 FEC Scaling
Minimum input frequency
is in the 155 MHz range
N/A
N/A
N/A
160.36
320.72
641.46
N/A
N/A
N/A
N/A MHz
N/A
N/A
â 178.90
â 357.80
â 715.59
Input Clock Rise Time (CLKIN)
Input Clock Fall Time (CLKIN)
Input Clock Duty Cycle
CLKOUT Frequency Range
FRQSEL[2:0] = 001
FRQSEL[2:0] = 000
FRQSEL[2:0] = 100
FRQSEL[2:0] = 010
FRQSEL[2:0] = 101
FRQSEL[2:0] = 011
FRQSEL[2:0] = 110
FRQSEL[2:0] = 111
tR
tF
CDUTY_IN
fO_19
fO_39
fO_78
fO_155
fO_311
fO_622
fO_1250
fO_2500
Figure 2
Figure 2
â
â
11
ns
â
â
11
ns
40
50
60
%
19.436 â 21.685
38.872 â 43.369
77.744 â 86.738
155.48 â 173.48 MHz
310.97 â 346.95
621.95 â 693.90
1243.9 â 1387.8
2487.8 â 2775.6
CLKOUT Rise Time
tR
Figure 2; single-ended;
â
190
220
ps
after 3 cm of 50 ⦠FR4
stripline
CLKOUT Fall Time
tF
Figure 2; single-ended;
â
185
205
ps
after 3 cm of 50 ⦠FR4
stripline
Output Clock Duty Cycle
CDUTY_OUT
Differential:
48
â
52
%
(CLKOUT+) â (CLKOUTâ)
RSTN/CAL Pulse Width
tRSTN
20
â
â
ns
Note: The Si5321 provides a 1/32x, 1/16x, 1/8x, 1/4x, 1/2x, 1x, 2x, 4x, 8x, 16x, 32x, 64x, or 128x clock multiplication function
with an option for additional frequency scaling by a factor of 255/238, 238/255, 255/237, 237/255, 66/64, or 64/66 for
FEC rate conversion.
8
Rev. 2.3
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