SI5345_16 Datasheet, PDF (37/60 Pages) Silicon Laboratories – 10-Channel, Any-Frequency, Any-Output Jitter Attenuator/ Clock Multiplier

Si5345/44/42 Rev D Data Sheet
Electrical Specifications
Table 5.12. Crystal Specifications
Parameter
Symbol
Test Condition
Min
Typ
Max
Unit
Crystal Frequency Range
f_XTAL
Full operating range. Jit-
24.97
—
54.06
MHz
ter performance may be
reduced.
Range for best jitter.
48
—
54
MHz
Load Capacitance
C_L
—
8
—
pF
Crystal Drive Level
d_L
—
—
200
µW
Equivalent Series Resistance
Shunt Capacitance
r_ESR
C_O
Refer to the Si5345/44/42 Reference Manual to determine ESR and shunt capac-
itance.
Note:
1. Refer to the Si5345/44/42 Reference Manual for recommended 48 to 54 MHz crystals. The Si5345/44/42 are designed to work
with crystals that meet these specifications.
Table 5.13. Thermal Characteristics
Parameter
Symbol
Test Condition ¹
Value
Si5345-64QFN
Thermal Resistance
Junction to Ambient
Still Air
22
θ_JA
Air Flow 1 m/s
19.4
Air Flow 2 m/s
18.3
Thermal Resistance
θ_JC
9.5
Junction to Case
Thermal Resistance
θ_JB
9.4
Junction to Board
Ψ_JB
9.3
Thermal Resistance
Ψ_JT
0.2
Junction to Top Center
Si5344, Si5342-44QFN
Thermal Resistance
Junction to Ambient
Still Air
22.3
θ_JA
Air Flow 1 m/s
19.4
Air Flow 2 m/s
18.4
Thermal Resistance
θ_JC
10.9
Junction to Case
Thermal Resistance
θ_JB
9.3
Junction to Board
Ψ_JB
9.2
Thermal Resistance
Ψ_JT
0.23
Junction to Top Center
Note:
1. Based on PCB Dimension: 3" x 4.5" PCB Thickness: 1.6 mm, PCB Land/Via: 36, Number of Cu Layers: 4
Unit
°C/W
°C/W
°C/W
°C/W
°C/W
°C/W
°C/W
°C/W
°C/W
°C/W
°C/W
°C/W
°C/W
°C/W
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