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Single-Chip Ethernet Controller with HP Auto-MDIX Support and PCI Interface
Datasheet
Revision 1.22 (09-25-08) 22 SMSC LAN9420/LAN9420i
DATASHEET
2.2 Buffer Types
BUFFER TYPE DESCRIPTION
IS Schmitt-triggered Input
O8 Output with 8mA sink and 8mA source current
O12 Output with 12mA sink and 12mA source current
OD12 Open-drain output with 12mA sink current
IPCI PCI compliant Input
OPCI PCI compliant Output
PU 50uA (typical) internal pull-up. Unless otherwise noted in the pin description, internal pull-ups
are always enabled.
Note: Internal pull-up resistors prevent unconnected inputs from floating. Do not rely on
internal resistors to drive signals external to LAN9420/LAN9420i. When connected
to a load that must be pulled high, an external resistor must be added.
PD 50uA (typical) internal pull-down. Unless otherwise noted in the pin description, internal pull-
downs are always enabled.
Note: Internal pull-down resistors prevent unconnected inputs from floating. Do not rely
on internal resistors to drive signals external to LAN9420/LAN9420i. When
connected to a load that must be pulled low, an external resistor must be added.
AI Analog Input
AIO Analog bi-directional
ICLK Crystal oscillator input
OCLK Crystal oscillator output
P Power and Ground pin