High Performance Two Port 10/100 Managed Ethernet Switch with 32-Bit Non-PCI CPU Interface

Datasheet

1.2Buffer Types

Table 1.1 describes the pin buffer type notation used in Chapter 3, "Pin Description and Configuration," on page 26 and throughout this document.

 

 

Table 1.1 Buffer Types

 

 

 

BUFFER TYPE

 

DESCRIPTION

 

 

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.

 

Note:

Internal pull-up resistors prevent unconnected inputs from floating. Do not rely on

 

 

internal resistors to drive signals external to the LAN9312. 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 the LAN9312. 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

 

 

 

Revision 1.4 (08-19-08)

18

SMSC LAN9312

 

DATASHEET