SMSC LAN9311 User Manual

Two Port 10/100 Managed Ethernet Switch with 16-Bit Non-PCI CPU Interface

Revision 1.4 (08-19-08)

18

SMSC LAN9311/LAN9311i

 

 describes the pin buffer type notation used in 

 and throughout this document.

IS

Schmitt-triggered Input

O8

Output with 8mA sink and 8mA source

OD8

Open-drain output with 8mA sink

O12

Output with 12mA sink and 12mA source

OD12

Open-drain output with 12mA sink

PU

50uA (typical) internal pull-up. Unless otherwise noted in the pin description, internal pull-
ups are always enabled.

Internal pull-up resistors prevent unconnected inputs from floating. Do not rely on 
internal resistors to drive signals external to the LAN9311/LAN9311i. 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.

Internal pull-down resistors prevent unconnected inputs from floating. Do not rely 
on internal resistors to drive signals external to the LAN9311/LAN9311i. When 
connected to a load that must be pulled low, an external resistor must be added.

AI

Analog input

AO

Analog output

AIO

Analog bi-directional

ICLK

Crystal oscillator input pin

OCLK

Crystal oscillator output pin

P

Power pin