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Small Footprint RMII 10/100 Ethernet Transceiver with HP Auto-MDIX Support
Datasheet
SMSC LAN8720/LAN8720i 71 Revision 1.0 (05-28-09)
DATASHEET
Note 7.5 These levels apply when a 0-3.3V Clock is driven into XTAL1/CLKIN and XTAL2 is floating.
The maximum input voltage on XTAL1/CLKIN is VDD2A + 0.4V.
Table 7.7 LAN Interface Signals
NAME V
IH
V
IL
I
OH
I
OL
V
OL
V
OH
TXP
See Table 7.12, “100Base-TX Transceiver Characteristics,” on page 72 and Table 7.13,
“10BASE-T Transceiver Characteristics,” on page 72.
TXN
RXP
RXN
Table 7.8 LED Signals
NAME V
IH
(V) V
IL
(V) I
OH
I
OL
V
OL
(V) V
OH
(V)
LED1/REGOFF 0.63 * VDD2A 0.39 * VDD2A -12 mA +12 mA +0.4 VDD2A – +0.4
LED2/nINTSEL 0.63 * VDD2A 0.39 * VDD2A -12 mA +12 mA +0.4 VDD2A – +0.4
Table 7.9 Configuration Inputs
NAME V
IH
(V) V
IL
(V) I
OH
I
OL
V
OL
(V) V
OH
(V)
RXD0/MODE0 0.68 * VDDIO 0.39 * VDDIO -8 mA +8 mA +0.4 VDDIO – +0.4
RXD1/MODE1 0.68 * VDDIO 0.39 * VDDIO -8 mA +8 mA +0.4 VDDIO – +0.4
RXER/PHYAD0 0.68 * VDDIO 0.39 * VDDIO -8 mA +8 mA +0.4 VDDIO – +0.4
CRS_DV/MODE2 0.68 * VDDIO 0.39 * VDDIO -8 mA +8 mA +0.4 VDDIO – +0.4
Table 7.10 General Signals
NAME V
IH
(V) V
IL
(V) I
OH
I
OL
V
OL
(V) V
OH
(V)
nINT/REFCLKO -8 mA +8 mA +0.4 VDDIO – +0.4
nRST 0.63 * VDDIO 0.39 * VDDIO
XTAL1/CLKIN (Note 7.5) +1.40 V 0.39 * VDD2A
XTAL2 - -
Table 7.11 Internal Pull-Up / Pull-Down Configurations
NAME PULL-UP OR PULL-DOWN
TXEN Pull-down
RXD0/MODE0 Pull-up