lan8720 Standard Microsystems Corp., lan8720 Datasheet - Page 14

• Manufacturer Part Number: lan8720
• Description: Small Footprint Rmii 10/100 Ethernet Transceiver With Hp Auto-mdix Support
• Manufacturer: Standard Microsystems Corp.

Chapter 3 Pin Description
Revision 1.0 (04-15-09)
BUFFER TYPE
Note 3.1
Note 3.1
Note 3.1
Note 3.1
OCLK
IOPU
IOPD
IOD8
ICLK
IPU
IPD
AIO
O8
AI
I8
P
This chapter describes the signals on each pin. When a lower case “n” is used at the beginning of the
signal name, it indicates that the signal is active low. For example, nRST indicates that the reset signal
is active low. The buffer type for each signal is indicated in the TYPE column, and a description of the
buffer types is provided in
Note 3.1
Note: The digital signals are not 5V tolerant.They are variable voltage from +1.6V to +3.6V, as shown
in
Input.
Output with 8mA sink and 8mA source.
Input/Open-drain output with 8mA sink.
Input with 67k (typical) internal pull-up.
Input with 67k (typical) internal pull-down.
Input/Output with 67k (typical) internal pull-up. Output has 8mA sink and 8mA source.
Input/Output with 67k (typical) internal pull-down. Output has 8mA sink and 8mA source.
Analog input
Analog bi-directional
Crystal oscillator input pin
Crystal oscillator output pin
Power pin
Table
Unless otherwise noted in the pin description, internal pull-up and pull-down resistors are
always enabled. The internal pull-up and pull-down resistors prevent unconnected inputs
from floating, and must not be relied upon to drive signals external to
When connected to a load that must be pulled high or low, an external resistor must be
added.
7.1.
Table
Table 3.1 Buffer Types
3.1.
DATASHEET
14
DESCRIPTION
Small Footprint RMII 10/100 Ethernet Transceiver with HP Auto-MDIX Support
SMSC LAN8720/LAN8720i
LAN8720/LAN8720i
Datasheet
.