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LAN8710A-EZC 데이터시트(PDF) 77 Page - SMSC Corporation

부품명 LAN8710A-EZC
상세설명  Small Footprint MII/RMII 10/100 Ethernet Transceiver with HP Auto-MDIX and flexPWR Technology
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제조업체  SMSC [SMSC Corporation]
홈페이지  http://www.smsc.com
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Small Footprint MII/RMII 10/100 Ethernet Transceiver with HP Auto-MDIX and flexPWR® Technology
Datasheet
SMSC LAN8710A/LAN8710Ai
77
Revision 1.4 (08-23-12)
DATASHEET
5.6
Clock Circuit
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 Table 5.13 for the
recommended crystal specifications.
Note 5.20 The maximum allowable values for Frequency Tolerance and Frequency Stability are
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).
Note 5.21 Frequency Deviation Over Time is also referred to as Aging.
Note 5.22 The total deviation for the Transmitter Clock Frequency is specified by IEEE 802.3u as
±100 PPM.
Note 5.23 0oC for extended commercial version, -40oC for industrial version.
Note 5.24 This number includes the pad, the bond wire and the lead frame. PCB capacitance is not
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.
Table 5.13 Crystal Specifications
PARAMETER
SYMBOL
MIN
NOM
MAX
UNITS
NOTES
Crystal Cut
AT, typ
Crystal Oscillation Mode
Fundamental Mode
Crystal Calibration Mode
Parallel Resonant Mode
Frequency
Ffund
-
25.000
-
MHz
Frequency Tolerance @ 25oCFtol
-
-
±50
PPM
Note 5.20
Frequency Stability Over Temp
Ftemp
-
-
±50
PPM
Note 5.20
Frequency Deviation Over Time
Fage
-
+/-3 to 5
-
PPM
Note 5.21
Total Allowable PPM Budget
-
-
±50
PPM
Note 5.22
Shunt Capacitance
CO
-7 typ-
pF
Load Capacitance
CL
-
20 typ
-
pF
Drive Level
PW
300
-
-
uW
Equivalent Series Resistance
R1
--
30
Ohm
Operating Temperature Range
Note 5.23
-+85
oC
XTAL1/CLKIN Pin Capacitance
-
3 typ
-
pF
Note 5.24
XTAL2 Pin Capacitance
-
3 typ
-
pF
Note 5.24


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