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LAN8740 Datasheet(PDF) 125 Page - Microchip Technology

Part # LAN8740
Description  Small Footprint MII/RMII 10/100 Energy Efficient Ethernet Transceiver with HP Auto-MDIX and flexPWR짰 Technology
PDF  136 Pages
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Manufacturer  MICROCHIP [Microchip Technology]
Direct Link  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

LAN8740 Datasheet(HTML) 125 Page - Microchip Technology

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 2013-2015 Microchip Technology Inc.
DS00001987A-page 125
LAN8740A/LAN8740Ai
3: The total deviation for the Transmitter Clock Frequency is specified by IEEE 802.3u as
±50 ppm.
4: 0°C for commercial version, -40°C for industrial version
5: +70°C for commercial version, +85°C for industrial version
6: 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. These two external load capacitors determine the accuracy of
the 25.000 MHz frequency.
5.7.2
100 µW 25 MHZ CRYSTAL SPECIFICATIONS
When utilizing a 100 µW 25 MHz crystal, the following circuit design (Figure 5-9) and specifications (Table 5-16) are
required to ensure proper operation.
FIGURE 5-9:
100 µW 25 MHZ CRYSTAL CIRCUIT
TABLE 5-16:
100 µW CRYSTAL SPECIFICATIONS
Parameter
Symbol
Min.
Nom.
Max.
Unit
Note
Crystal Cut
AT, typ
Crystal Oscillation Mode
Fundamental Mode
Crystal Calibration Mode
Parallel Resonant Mode
Frequency
Ffund
-
25.000
-
MHz
Frequency Tolerance at 25oCFtol
-
-
±50
ppm
(see Note 1)
Frequency Stability Over Temp
Ftemp
-
-
±50
ppm
(see Note 1)
Frequency Deviation Over Time
Fage
-
±3 to 5
-
ppm
(see Note 2)
Total Allowable PPM Budget
-
-
±50
ppm
(see Note 3)
Shunt Capacitance
CO
--5
pF
Load Capacitance
CL
8-
12
pF
Drive Level
PW
-
100
-
µW
(see Note 4)
Equivalent Series Resistance
R1
--80
Ω
XTAL2 Series Resistor
RS
495
500
505
Ohm
Operating Temperature Range
(see Note 5)-
(see Note 6) oC
XTAL1/CLKIN Pin Capacitance
-
3 typ
-
pF
(see Note 7)
XTAL2 Pin Capacitance
-
3 typ
-
pF
(see Note 7)
LAN8740
XTAL2
XTAL1
RS
Y1
C1
C2



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