Datasheet

LAN8700/LAN8700i
DS00002260A-page 62  2007-2016 Microchip Technology Inc.
Note 7-4 Measured at the line side of the transformer, line replaced by 100 (± 1%) resistor.
Note 7-5 Offset from 16 nS pulse width at 50% of pulse peak.
Note 7-6 Measured differentially.
Note 7-7 Min/max voltages ensured as measured with 100 resistive load.
RX_ER/RXD4 Pull-down
RX_DV Pull-down
TX_EN Pull-down
Note: For VDDIO operation below +2.5V, Microchip recommends designs add external strapping resistors in
addition the internal strapping resistors to ensure proper strapped operation.
TABLE 7-12: 100BASE-TX TRANSCEIVER CHARACTERISTICS
Parameter Symbol MIN TYP MAX Units Notes
Peak Differential Output Voltage High V
PPH
950 - 1050 mVpk Note 7-4
Peak Differential Output Voltage Low V
PPL
-950 - -1050 mVpk Note 7-4
Signal Amplitude Symmetry V
SS
98 - 102 % Note 7-4
Signal Rise & Fall Time T
RF
3.0 - 5.0 nS Note 7-4
Rise & Fall Time Symmetry T
RFS
--0.5nSNote 7-4
Duty Cycle Distortion D
CD
35 50 65 % Note 7-5
Overshoot & Undershoot V
OS
--5%
Jitter 1.4 nS Note 7-6
TABLE 7-13: 10BASE-T TRANSCEIVER CHARACTERISTICS
Parameter Symbol MIN TYP MAX Units Notes
Transmitter Peak Differential Output Voltage V
OUT
2.2 2.5 2.8 V Note 7-7
Receiver Differential Squelch Threshold V
DS
300 420 585 mV
TABLE 7-11: INTERNAL PULL-UP / PULL-DOWN CONFIGURATIONS (CONTINUED)
Name Pull-up or Pull-down