LAN9215-MT-E2 SMSC [SMSC Corporation], LAN9215-MT-E2 Datasheet - Page 133

• Manufacturer Part Number: LAN9215-MT-E2
• Description: Highly Efficient 10/100 Ethernet Controller with HP Auto-MDIX
• Manufacturer: SMSC [SMSC Corporation]

Highly Efficient Single-Chip 10/100 Ethernet Controller with HP Auto-MDIX
Datasheet
SMSC LAN9215
7.5
Transmitter Peak Differential
Output Voltage
Receiver Differential Squelch
Threshold
PARAMETER
Frequency Stability Over Temp
Frequency Tolerance @ 25° C
Note 7.6
The LAN9215 can accept either a 25MHz crystal (preferred) or a 25 MHz clock oscillator (±50 PPM)
input. The LAN9215 shares the 25MHz clock oscillator input (CLKIN) with the crystal input
XTAL1/CLKIN (pin 6).
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 LAN9215
crystal input/output signals (XTAL1, XTAL2). See
specifications.
Additionally, SMSC recommends a series resistor for the crystal circuit. Further details are provided in
SMSC Application Note AN10.7 - “Parallel Crystal Circuit Input Voltage Control” and in the LAN9215
Reference Schematic.
Clock Circuit
Operating Temp Range
Shunt Capacitance
Load Capacitance
Fox Electronics
Drive Level
Measured at the line side of the transformer, line replaced by 100Ω (+/- 1%) resistor.
Table 7.6 10BASE-T Transceiver Characteristics
SYMBOL
Table 7.8 Recommended Crystals
V
Table 7.7 Crystal Specifications
V
OUT
DS
DATASHEET
MIN
300
2.2
133
TYP
420
2.5
Table 7.7, "Crystal Specifications"
MAX
585
2.8
20 pF ~ Parallel
FOXS/250F-20
0 to 70° C
±50 PPM
±50 PPM
0.5 mW
7.0 pF
UNITS
mV
V
Revision 1.5 (07-18-06)
Note 7.6
NOTES
for crystal