Intel® 82562EZ(EX), 82551QM & 82540EM Dual Footprint LOM (AP-434)
The Intel® 82540EM Gigabit Ethernet Controller, the Intel® 82551QM Fast Ethernet Controller, and the Intel® 82562EZ(EX) Fast Ethernet Controller are all manufactured in a footprint compatible 15 mm x 15 mm, 196-ball grid array package. Many of the critical signal pin locations on the 82540EM and 82551QM are identical to signals on the 82562EZ(EX) allowing designers to create a single design that accommodates these three parts. Because the usage of some pins on the 82540EM differ from the usage on the 82551QM and the 82562EZ(EX), the three parts are not referred to as "pin compatible". The term "footprint compatible" refers to the fact that the parts share the same package size, same number and pattern of pins, and layout of signals that allow for the flexible, cost effective, multipurpose design. As a result, it is easy to populate a single board design with any of the three parts to maximize value matching your customers' performance needs.
This application note identifies the design differences between the 82540EM, 82551QM, and 82562EZ(EX). The table in Section 8.0 lists the stuffing (population) options for the three parts.
For other necessary design collateral, please refer to “Reference Documents” (Section 1.2).
Read the full Intel® 82562EZ(EX), 82551QM & 82540EM Dual Footprint LOM application note.