Migrating from the LAN83C180 10/100 PHY to the LAN83C185 10/100 PHY

SMSC AN 10.13

Page 4

Revision 1.2 (07-12-04)

APPLICATION NOTE

2

Summary of Differences Between the LAN83C180 and

LAN83C185

The areas listed below briefly outline areas of change that a designer needs to address when transitioning

from the LAN83C180 to LAN83C185 designs. For details, please refer to the corresponding sections in this

application note.

Table 2.1 – Design Transitions from the LAN83C180 to LAN83C185

SECTION

DESCRIPTION

PAGE (S)

3 Power Requirements

+3v Voltage Source

5

Magnetics

6

Transmit Terminations

6

4 Cable Interface

Receive Terminations

7

5 Clock Circuit

Parallel Crystal Circuit

Crystal Series Terminations

8

6 LED’s

LED Function Indicators

8

Pinout Differences

Non-Pin Compatible

9

PHY Address

Dedicated vs. Non-dedicated pins

9

MII Interface

MDIO Pull-up

RX Series Terminations

9

RBIAS

Dual vs. Single RBIAS Pin

10

7 General Considerations

Mode

Dual- vs. Tri-pin Implementation

10