Application Note AC342
CQFP to CLGA Adapter Socket
Table of Contents
Introduction . . . . . . . . . . . . . . . . . . . . . .
CQ to LG Adapter Socket . . . . . . . . . . . . . . .
CQ to LG Adapter Socket Assembly Procedure . . .
CQ352 to LG1272 Adapter Socket Outline Drawing .
Reflow Profile . . . . . . . . . . . . . . . . . . . . .
CQ to LG Adapter Pin Mapping List . . . . . . . . .
Prototyped Product, Adapter, and PCB Design Matrix
List of Changes . . . . . . . . . . . . . . . . . . . .
Support . . . . . . . . . . . . . . . . . . . . . . . .
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
1
1
3
6
7
8
8
8
9
Introduction
RTAX-S/L is next generation, designed-for-space, metal-to-metal antifuse field programmable gate array
(FPGA) family by Microsemi. RTAX-S/L is a derivative of the Axcelerator
®
family with up to two million-
system gates. RTAX-S/L FPGAs provide the designer with nearly 500K ASIC gates, with error detection
and correction (EDAC) protected static RAM. Microsemi offers RTAX-S/L devices in two package styles:
the ceramic column grid array (CCGA or CG) and ceramic quad flat pack (CQFP or CQ).
Microsemi has developed prototyping methods for RTAX-S/L devices in CG/CQ packages, using the
ceramic land grid array (CLGA) package as a prototyping vehicle with the CQ to LG and CG to LG
adapter sockets. This document describes the procedure for assembling the CQ to LG adapter socket.
CQ to LG Adapter Socket
The CQ to LG adapter socket has an LG configuration on the top and a CQ configuration on the bottom.
The adapter socket enables customers to use an LG package during prototyping, and then switch to an
equivalent CQFP package for production. There is one CQ to LG adapter socket available. The top and
bottom ordering part numbers are listed in
Table 1.
Table 1 •
Adapter Socket Part Number
Adapter Socket
CQ352 to LG1272
Ordering Part Number
Prototyped and Prototype Device
SK-RT4K-KITTOP
and For prototyping RTAX4000S/SL-CQ352 using RTAX4000S/SL-
SK-RT4K-CQ352-KITBTM LG1272 package
February 2013
© 2013 Microsemi Corporation
1
CQFP to CLGA Adapter Socket
Figure 1
shows the complete CQ352 to LG1272 assembly kit. SK-RT4K-KITTOP contains an interposer
(3), a socket lid (4), and eight screws (5). SK-RT4K-CQ352-KITBTM contains a ceramic adapter (1),
which is an unique adapter for RTAX4000S/SL, socket housing (2), and eight screws (5).
Figure 1 •
Parts of CQ352 to LG1272 Adapter Socket: (1) Ceramic Adapter, (2) Socket Housing,
(3) Socket Interposer, (4) Socket Lid, (5) Fixing Screws
Figure 2
shows the top view, bottom view, and orientation view for the RTAX4000S/SL CQ352 to LG1272
adapter.
Figure 2 •
RTAX4000S/SL CQ352 to LG1272 Ceramic Adapter: Top View, Bottom View, and Orientation
Drawing
2
CQ to LG Adapter Socket Assembly Procedure
CQ to LG Adapter Socket Assembly Procedure
Step 1
Trim and form the CQ ceramic adapter.
Note:
Do not reflow the adapter to the circuit board until the housing has been attached, as detailed in
Step 2
below.
Figure 3 •
CQ352 to LG1272 Adapter Trim and Form
Step 2
Assemble socket housing to adapter. A torque limit screw driver is not required (Figure
4).
Figure 4 •
Assemble Socket Housing to CQ352 to LG1272 Adapter
Note:
The housing, eight screws, and ceramic adapter form the –KITBTM assembly.
3
CQFP to CLGA Adapter Socket
Step 3
Reflow the adapter to the printed circuit board (PCB) as shown in (Figure
5).
Note:
Since reflow profiles heavily depend upon the size of the board and its components, perform reflow
process optimization for better results.
Figure 5 •
Reflow Adapter (with socket housing mounted) to PCB
Step 4
Place the socket interposer into the adapter (Figure
6).
Figure 6 •
Place the Socket Interposer into Adapter Assembly
4
CQ to LG Adapter Socket Assembly Procedure
Step 5
Place the LG1272 package into the adapter (Figure
7).
Figure 7 •
Place LG1272 Package into Adapter Assembly
Step 6
Place and tighten the socket lid to the socket housing with the remaining eight screws (Figure
8).
A
torque limit screw diver is not required.
Figure 8 •
Place and Tighten Socket Lid Using Eight Screws and Optional Alignment Pins
5
京公网安备 11010802033920号
Copyright © 2005-2026 EEWORLD.com.cn, Inc. All rights reserved
电子工程世界
