LAN8720AI-CP-TR Standard Microsystems (SMSC), LAN8720AI-CP-TR Datasheet - Page 74

• Manufacturer Part Number: LAN8720AI-CP-TR
• Manufacturer: Standard Microsystems (SMSC)

Specifications of LAN8720AI-CP-TR

• Number Of Receivers: 1
• Protocols Supported: IEEE 802.3
• Operating Supply Voltage (typ): 1.8/2.5/3.3V
• Package Type: QFN
• Operating Temperature Classification: Industrial
• Mounting: Surface Mount
• Operating Temperature (max): 85C
• Operating Temperature (min): -40C
• Lead Free Status / Rohs Status: Compliant

Revision 1.0 (12-09-09)
5.6
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
XTAL1/CLKIN Pin Capacitance
XTAL2 Pin Capacitance
PARAMETER
The device can accept either a 25MHz crystal or a 25MHz single-ended clock oscillator (±50ppm)
input. If the single-ended clock oscillator method is implemented, XTAL2 should be left unconnected
and XTAL1/CLKIN should be driven with a nominal 0-3.3V clock signal. See
recommended crystal specifications.
Note 5.18 The maximum allowable values for Frequency Tolerance and Frequency Stability are
Note 5.19 Frequency Deviation Over Time is also referred to as Aging.
Note 5.20 The total deviation for the Transmitter Clock Frequency is specified by IEEE 802.3u as
Note 5.21 0
Note 5.22 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).
±100 PPM.
included in this value. The XTAL1/CLKIN pin, XTAL2 pin and PCB capacitance values are
required to accurately calculate the value of the two external load capacitors. The total load
capacitance must be equivalent to what the crystal expects to see in the circuit so that the
crystal oscillator will operate at 25.000 MHz.
o
C for extended commercial version, -40
o
C
SYMBOL
F
F
F
F
P
Table 5.13 Crystal Specifications
C
temp
C
R
fund
age
tol
W
O
L
1
DATASHEET
Note 5.21
MIN
300
-
Parallel Resonant Mode
-
-
-
-
-
-
-
-
-
74
Fundamental Mode
Small Footprint RMII 10/100 Ethernet Transceiver with HP Auto-MDIX Support
AT, typ
+/-3 to 5
25.000
20 typ
NOM
7 typ
3 typ
3 typ
o
C for industrial version.
-
-
-
-
-
-
MAX
±50
±50
±50
+85
30
-
-
-
-
-
-
-
SMSC LAN8720/LAN8720i
UNITS
PPM
PPM
PPM
PPM
Ohm
MHz
uW
pF
pF
o
pF
pF
C
Table 5.13
Note 5.18
Note 5.18
Note 5.19
Note 5.20
Note 5.22
Note 5.22
NOTES
Datasheet
for the