lan8720 Standard Microsystems Corp., lan8720 Datasheet - Page 17

• Manufacturer Part Number: lan8720
• Description: Small Footprint Rmii 10/100 Ethernet Transceiver With Hp Auto-mdix Support
• Manufacturer: Standard Microsystems Corp.

Small Footprint RMII 10/100 Ethernet Transceiver with HP Auto-MDIX Support
Datasheet
SMSC LAN8720/LAN8720i
3.5
3.6
3.7
SIGNAL
SIGNAL
SIGNAL
VDDCR
VDD1A
VDD2A
VDDIO
RBIAS
NAME
NAME
NAME
RXP
RXN
TXP
TXN
VSS
10/100 Line Interface Signals
Analog Reference
Power Signals
24-QFN
24-QFN
24-QFN
PIN #
PIN #
PIN #
FLAG
21
20
23
22
24
19
9
6
1
TYPE
TYPE
TYPE
GND
AIO
AIO
AIO
AIO
AI
P
P
P
P
Table 3.6 10/100 Line Interface Signals 24-QFN
Transmit/Receive Positive Channel 1.
Transmit/Receive Negative Channel 1.
Transmit/Receive Positive Channel 2.
Transmit/Receive Negative Channel 2.
External 1% Bias Resistor. Requires an 12.1k resistor to ground connected
as described in the Analog Layout Guidelines. The nominal voltage is 1.2V
and therefore the resistor will dissipate approximately 1mW of power.
+1.6V to +3.6V Variable I/O Pad Power
+1.2V (Core voltage) - 1.2V for digital circuitry on chip. Supplied by the on-
chip regulator unless configured for regulator off mode using the
RXCLK/REGOFF pin. A 1uF decoupling capacitor to ground should be used
on this pin when using the internal 1.2V regulator.
+3.3V Analog Port Power to Channel 1.
+3.3V Analog Port Power to Channel 2 and to internal regulator.
The flag must be connected to the ground plane with a via array under the
exposed flag. This is the ground connection for the IC.
Table 3.7 Analog References 24-QFN
Table 3.8 Power Signals 24-QFN
DATASHEET
17
DESCRIPTION
DESCRIPTION
DESCRIPTION
Revision 1.0 (04-15-09)