SI5321 Datasheet, PDF (8/34 Pages) List of Unclassifed Manufacturers – SONET/SDH PRECISION CLOCK MULTIPLIER IC

Si5321
Table 3. AC Characteristics (Continued)
(V_DD33 = 3.3 V ±5%, T_A = –20 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
f_CLKIN
66/64 FEC Scaling
Minimum input frequency is
in the 155 MHz range,
FXDDELAY = 1
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
— 168.22
— 336.44
— 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
f_CLKIN
64/66 FEC Scaling
Minimum input frequency is
in the 155 MHz range,
FXDDELAY = 1
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
— 178.90
— 357.80
— 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
t_R
t_F
C_{DUTY_IN}
f_{O_19}
f_{O_39}
f_{O_78}
f_{O_155}
f_{O_311}
f_{O_622}
f_{O_1250}
f_{O_2500}
Figure 2
Figure 2
—
—
11
ns
—
—
11
ns
40
50
60
%
19.436 — 21.685
38.872 — 43.369
77.744 — 86.738
155.48 — 173.48 _MHz
310.97 — 346.95
621.95 — 693.90
1243.9 — 1387.8
2487.8 — 2775.6
CLKOUT Rise Time
t_R
Figure 2; differential; after
—
190
220
ps
3 cm of 50  FR4 stripline,
FRQSEL[0:2] = 011
CLKOUT Fall Time
t_F
Figure 2; differential; after
—
190
220
ps
3 cm of 50  FR4 stripline,
FRQSEL[0:2] = 011
Output Clock Duty Cycle
C_{DUTY_OUT}
Differential:
48
—
52
%
(CLKOUT+) – (CLKOUT–),
FRQSEL[0:2] = 011
RSTN/CAL Pulse Width
t_RSTN
20
—
—
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. 2.5