SMSC LAN9312 - Manual (Page 18)

High Performance Two Port 10/100 Managed Ethernet Switch with 32-Bit Non-PCI CPU Interface
Datasheet
Revision 1.4 (08-19-08) 18 SMSC LAN9312
DATASHEET
1.2 Buffer 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