Small Footprint RMII 10/100 Ethernet Transceiver with HP Auto-MDIX Support
Datasheet
Table 7.11 Internal Pull-Up / Pull-Down Configurations (continued)
NAME
PULL-UP OR PULL-DOWN
RXD1/MODE1
RXER/PHYAD0
CRS_DV/MODE2
LED1/REGOFF
LED2/nINTSEL
MDIO
Pull-up
Pull-down
Pull-up
Pull-down
Pull-up
Pull-up
nINT/REFCLKO
nRST
Pull-up
Pull-up
Table 7.12 100Base-TX Transceiver Characteristics
PARAMETER
SYMBOL
MIN
TYP
MAX
UNITS
NOTES
Peak Differential Output Voltage High
Peak Differential Output Voltage Low
Signal Amplitude Symmetry
Signal Rise & Fall Time
Rise & Fall Time Symmetry
Duty Cycle Distortion
VPPH
VPPL
VSS
950
-950
98
3.0
-
-
-
1050
-1050
102
5.0
mVpk
mVpk
%
Note 7.6
Note 7.6
Note 7.6
Note 7.6
Note 7.6
Note 7.7
-
TRF
-
nS
TRFS
DCD
VOS
-
0.5
nS
35
-
50
-
65
%
Overshoot & Undershoot
Jitter
5
%
1.4
nS
Note 7.8
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.
Table 7.13 10BASE-T Transceiver Characteristics
PARAMETER
SYMBOL
MIN
TYP
MAX
UNITS
NOTES
Transmitter Peak Differential Output Voltage
Receiver Differential Squelch Threshold
VOUT
VDS
2.2
2.5
2.8
V
Note 7.9
300
420
585
mV
Note 7.9 Min/max voltages guaranteed as measured with 100Ω resistive load.
Revision 1.0 (05-28-09)
SMSC LAN8720/LAN8720i
DATA7S2HEET
SMSC [ SMSC CORPORATION ]
