lan9313 Standard Microsystems Corp., lan9313 Datasheet - Page 394
lan9313
Manufacturer Part Number
lan9313
Description
Lan9313/lan9313i Three Port 10/100 Managed Ethernet Switch With Mii
Manufacturer
Standard Microsystems Corp.
Datasheet
1.LAN9313.pdf
(398 pages)
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Revision 1.2 (04-08-08)
14.6
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
n/a XI Pin Capacitance
n/a XO Pin Capacitance
PARAMETER
The LAN9313/LAN9313i 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 14.12 The maximum allowable values for Frequency Tolerance and Frequency Stability are
Note 14.13 Frequency Deviation Over Time is also referred to as Aging.
Note 14.14 The total deviation for the Transmitter Clock Frequency is specified by IEEE 802.3 as
Note 14.15 This number includes the pad, the bond wire and the lead frame. PCB capacitance is not
Note 14.16 +70
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
Table 14.10 LAN9313/LAN9313i Crystal Specifications
C
o
C for commercial version (LAN9313), +85
SYMBOL
F
F
F
F
P
C
temp
C
R
fund
age
tol
W
O
L
1
Table 14.10
DATASHEET
MIN
0.5
0
-
Parallel Resonant Mode
-
-
-
-
-
-
-
-
-
394
Fundamental Mode
for crystal specifications.
AT, typ
+/-3 to 5
25.000
20 typ
NOM
7 typ
3 typ
3 typ
-
-
-
-
-
-
o
C for industrial version (LAN9313I)
Three Port 10/100 Managed Ethernet Switch with MII
+70Note 1
+/-50
+/-50
+/-50
MAX
4.16
30
-
-
-
-
-
-
-
SMSC LAN9313/LAN9313i
UNITS
PPM
PPM
PPM
PPM
Ohm
MHz
mW
pF
pF
o
pF
pF
C
Note 14.12
Note 14.12
Note 14.13
Note 14.14
Note 14.15
Note 14.15
NOTES
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