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Small Footprint RMII 10/100 Ethernet Transceiver with HP Auto-MDIX Support
Datasheet
Revision 1.0 (05-28-09) 72 SMSC LAN8720/LAN8720i
DATASHEET
Note 7.6 Measured at the line side of the transformer, line replaced by 100Ω (± 1%) resistor.
Note 7.7 Offset from 16 nS pulse width at 50% of pulse peak
Note 7.8 Measured differentially.
Note 7.9 Min/max voltages guaranteed as measured with 100Ω resistive load.
RXD1/MODE1 Pull-up
RXER/PHYAD0 Pull-down
CRS_DV/MODE2 Pull-up
LED1/REGOFF Pull-down
LED2/nINTSEL Pull-up
MDIO Pull-up
nINT/REFCLKO Pull-up
nRST Pull-up
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 7.6
Peak Differential Output Voltage Low V
PPL
-950 - -1050 mVpk Note 7.6
Signal Amplitude Symmetry V
SS
98 - 102 % Note 7.6
Signal Rise & Fall Time T
RF
3.0 - 5.0 nS Note 7.6
Rise & Fall Time Symmetry T
RFS
--0.5nSNote 7.6
Duty Cycle Distortion D
CD
35 50 65 % Note 7.7
Overshoot & Undershoot V
OS
--5%
Jitter 1.4 nS Note 7.8
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 7.9
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