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SMSC LAN9420i Manual De Usuario

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Single-Chip Ethernet Controller with HP Auto-MDIX Support and PCI Interface
Datasheet
Revision 1.22 (09-25-08)
20
SMSC LAN9420/LAN9420i
DATASHEET
Table 2.6 Power and Ground Pins
NUM
PINS
NAME
SYMBOL
BUFFER
TYPE
DESCRIPTION
2
+3.3V 
Analog 
Power 
Supply
VDD33A
P
+3.3V Analog Power Supply
Refer to the LAN9420/LAN9420i application note for 
connection information.
1
+1.8V PLL 
Power 
Supply
VDD18PLL
P
+1.8V PLL Power Supply: This pin must be connected 
to VDD18CORE for proper operation.
Refer to the LAN9420/LAN9420i application note for 
additional connection information.
1
+1.8V TX 
Power 
Supply
VDD18TX
P
+1.8V Transmitter Power Supply: This pin must be 
connected to VDD18CORE for proper operation.
Refer to the LAN9420/LAN9420i application note for 
additional connection information.
1
+3.3V 
Master Bias 
Power 
Supply
VDD33BIAS
P
+3.3V Master Bias Power Supply
Refer to the LAN9420/LAN9420i application note for 
additional connection information.
15
+3.3V I/O 
Power
VDD33IO
P
+3.3V Power Supply for I/O Pins and Internal 
Regulator
Refer to the LAN9420/LAN9420i application note for 
additional connection information.
21
Ground
VSS
P
Common Ground for I/O Pins, Core, and Analog 
Circuitry
3
+1.8V Core 
Power
VDD18CORE
P
Digital Core +1.8V Power Supply Output from 
Internal Regulator
Refer to the LAN9420/LAN9420i application note for 
additional connection information.
Table 2.7 No-Connect Pins
NUM
PINS
NAME
SYMBOL
BUFFER
TYPE
DESCRIPTION
17
No Connect
NC
-
No Connect: These pins must be left floating for 
normal device operation.