Datasheet

±15kV ESD Protected MII/RMII 10/100 Ethernet Transceiver with HP Auto-MDIX Support and flexPWR
®
Technology in a Small Footprint
Datasheet
SMSC LAN8700/LAN8700i 17 Revision 2.3 (04-12-11)
DATASHEET
CLKIN/
XTAL1
I/O Clock Input – 25 Mhz or 50 MHz external clock or crystal input.
In MII mode, this signal is the 25 MHz reference input clock
In RMII mode, this signal is the 50 MHz reference input clock
which is typically also driven to the RMII compliant Ethernet MAC
clock input.
Note: See Section 4.10, "nINT/TX_ER/TXD4 Strapping," on
page 32 for additional details on Strapping options.
XTAL2 O Clock Output – 25 MHz crystal output.
Note: Float this pin if using an external clock being driven
through CLKIN/XTAL1
Table 3.6 10/100 Line Interface
SIGNAL NAME TYPE DESCRIPTION
TXP AO Transmit Data Positive: 100Base-TX or 10Base-T differential
transmit outputs to magnetics.
TXN AO Transmit Data Negative: 100Base-TX or 10Base-T differential
transmit outputs to magnetics.
RXP AI Receive Data Positive: 100Base-TX or 10Base-T differential
receive inputs from magnetics.
RXN AI Receive Data Negative: 100Base-TX or 10Base-T differential
receive inputs from magnetics.
Table 3.7 Analog References
SIGNAL NAME TYPE DESCRIPTION
EXRES1 AI Connects to reference resistor of value 12.4K-Ohm, 1%
connected as described in the Analog Layout Guidelines. The
nominal voltage is 1.2V and therefore the resistor will dissipate
approximately 1mW of power.
Table 3.8 Power Signals
SIGNAL NAME TYPE DESCRIPTION
VDDIO POWER
+1.6V to +3.6V Variable I/O Pad Power
VDD33 POWER +3.3V Core Regulator Input.
VDDA3.3 POWER +3.3V Analog Power
Table 3.5 General Signals (continued)
SIGNAL NAME TYPE DESCRIPTION