LAN9514I-JZX SMSC, LAN9514I-JZX Datasheet - Page 46

• Manufacturer Part Number: LAN9514I-JZX
• Description: Ethernet ICs Hi-Speed USB 2.0 Hub High Perf 10/100 Ind
• Manufacturer: SMSC

Specifications of LAN9514I-JZX

• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Revision 1.0 (11-24-09)
4.6
Crystal Cut
Crystal Oscillation Mode
Crystal Calibration Mode
Frequency
Frequency Tolerance @ 25
Frequency Stability Over Temp
Frequency Deviation Over Time
Total Allowable PPM Budget
Shunt Capacitance
Load Capacitance
Drive Level
Equivalent Series Resistance
Operating Temperature Range
LAN9514/LAN9514i XI Pin
Capacitance
LAN9514/LAN9514i XO Pin
Capacitance
PARAMETER
LAN9514/LAN9514i can accept either a 25MHz crystal (preferred) or a 25MHz single-ended clock
oscillator (+/- 50ppm) input. If the single-ended clock oscillator method is implemented, XO should be
left unconnected and XI should be driven with a nominal 0-3.3V clock signal. The input clock duty cycle
is 40% minimum, 50% typical and 60% maximum.
It is recommended that a crystal utilizing matching parallel load capacitors be used for the crystal
input/output signals (XI/XO). See
Note 4.13 The maximum allowable values for Frequency Tolerance and Frequency Stability are
Note 4.14 Frequency Deviation Over Time is also referred to as Aging.
Note 4.15 The total deviation for the Transmitter Clock Frequency is specified by IEEE 802.3u as
Note 4.16 0
Note 4.17 +70
Note 4.18 This number includes the pad, the bond wire and the lead frame. PCB capacitance is not
Clock Circuit
application dependant. Since any particular application must meet the IEEE +/-50 PPM
Total PPM Budget, the combination of these two values must be approximately +/-45 PPM
(allowing for aging).
+/- 50 PPM.
included in this value. The XO/XI pin and PCB capacitance values are required to
accurately calculate the value of the two external load capacitors. These two external load
capacitors determine the accuracy of the 25.000 MHz frequency.
o
C for commercial version, -40
o
C
o
Table 4.7 LAN9514/LAN9514i Crystal Specifications
C for commercial version, +85
SYMBOL
F
F
F
F
P
C
temp
C
R
fund
age
tol
W
O
L
1
Table 4.7
DATASHEET
Note 4.16
MIN
300
Parallel Resonant Mode
-
-
-
-
-
-
-
-
-
-
46
for the recommended crystal specifications.
o
Fundamental Mode
C for industrial version.
o
C for industrial version.
AT, typ
+/-3 to 5
25.000
20 typ
NOM
7 typ
3 typ
3 typ
-
-
-
-
-
-
USB 2.0 Hub and 10/100 Ethernet Controller
Note 4.17
+/-50
+/-50
+/-50
MAX
50
-
-
-
-
-
-
-
SMSC LAN9514/LAN9514i
UNITS
PPM
PPM
PPM
PPM
Ohm
MHz
uW
pF
pF
o
pF
pF
C
Note 4.13
Note 4.13
Note 4.14
Note 4.15
Note 4.18
Note 4.18
NOTES
Datasheet