LAN8740A Datasheet, PDF (14/136 Pages) Microchip Technology – Small Footprint MII/RMII 10/100 Energy Efficient Ethernet Transceiver with HP Auto-MDIX and flexPWR® Technology

LAN8740A/LAN8740Ai
TABLE 2-6: ANALOG REFERENCE PINS
Num Pins
1
Name
External 1%
Bias Resistor
Input
Symbol
RBIAS
Buffer Type
Description
AI
This pin requires connection of a 12.1 kΩ (1%)
resistor to ground.
Refer to the LAN8740A/LAN8740Ai reference
schematic for connection information.
Note:
The nominal voltage is 1.2 V and the
resistor will dissipate approximately
1 mW of power.
TABLE 2-7: POWER PINS
Num Pins
1
Name
+1.8 V to +3.3 V
Variable I/O
Power
Symbol
VDDIO
1
+1.2 V Digital
VDDCR
Core Power
Supply
1
+3.3 V Channel VDD1A
1 Analog Port
Power
1
+3.3 V Channel VDD2A
2 Analog Port
Power
1
Ground
VSS
Buffer Type
Description
P
+1.8 V to +3.3 V variable I/O power.
Refer to the LAN8740A/LAN8740Ai reference
schematic for connection information.
P
Supplied by the on-chip regulator unless config-
ured for regulator off mode via the REGOFF con-
figuration strap.
Refer to the LAN8740A/LAN8740Ai reference
schematic for connection information.
Note:
1 µF and 470 pF decoupling capaci-
tors in parallel to ground should be
used on this pin.
P
+3.3 V Analog Port Power to Channel 1.
Refer to the LAN8740A/LAN8740Ai reference
schematic for connection information.
P
+3.3 V Analog Port Power to Channel 2 and the
internal regulator.
Refer to the LAN8740A/LAN8740Ai reference
schematic for connection information.
P
Common ground. This exposed pad must be con-
nected to the ground plane with a via array.
DS00001987A-page 14
 2013-2015 Microchip Technology Inc.