LAN8187I-JT Standard Microsystems (SMSC), LAN8187I-JT Datasheet - Page 65

• Manufacturer Part Number: LAN8187I-JT
• Manufacturer: Standard Microsystems (SMSC)

Specifications of LAN8187I-JT

• Number Of Receivers: 1
• Data Rate: 10/100Mbps
• Operating Supply Voltage (typ): 3.3V
• Package Type: TQFP
• Operating Temperature Classification: Industrial
• Operating Supply Voltage (max): 3.6V
• Operating Supply Voltage (min): 3V
• Mounting: Surface Mount
• Pin Count: 64
• Operating Temperature (max): 85C
• Operating Temperature (min): -40C
• Lead Free Status / RoHS Status: Compliant

±15kV ESD Protected MII/RMII 10/100 Ethernet Transceiver with HP Auto-MDIX & flexPWR
Datasheet
SMSC LAN8187/LAN8187i
6.6
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
LAN8187/LAN8187i
XTAL1/CLKIN Pin Capacitance
LAN8187/LAN8187i XTAL2 Pin
Capacitance
PARAMETER
LAN8187/LAN8187i can accept either a 25MHz crystal or a 25MHz single-ended clock oscillator
(±50ppm) input for operation in MII mode. 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. The user is required to supply a 50MHz single-ended clock for RMII operation. The input clock
duty cycle is 40% minimum, 50% typical and 60% maximum. See
crystal specifications.
Note 6.1
Note 6.2
Note 6.3
Note 6.4
Note 6.5
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.
Clock Circuit
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).
Frequency Deviation Over Time is also referred to as Aging.
The total deviation for the Transmitter Clock Frequency is specified by IEEE 802.3u as
±100 PPM.
0
+70
o
C for commercial version, -40
o
C
o
Table 6.12 LAN8187/LAN8187i Crystal Specifications
C for commercial version, +85
SYMBOL
F
F
F
F
P
C
temp
C
R
fund
age
tol
W
O
L
1
DATASHEET
Note 6.4
MIN
0.5
Parallel Resonant Mode
-
-
-
-
-
-
-
-
-
-
65
o
Fundamental Mode
C for industrial version.
®
o
Technology
C for industrial version.
AT, typ
+/-3 to 5
25.000
20 typ
NOM
7 typ
3 typ
3 typ
-
-
-
-
-
-
Note 6.5
MAX
Table 6.12
±50
±50
±50
30
-
-
-
-
-
-
-
UNITS
for the recommended
PPM
PPM
PPM
PPM
Ohm
MHz
mW
Revision 1.6 (02-27-09)
pF
pF
o
pF
pF
C
Note 6.1
Note 6.1
Note 6.2
Note 6.3
NOTES