AC342: Microsemi CQFP to CLGA Adapter Socket Application Note

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 . . . . . . . . . . . . . . . . . . . . . . . .
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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 millionsystem 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
February 2013
© 2013 Microsemi Corporation
Ordering Part Number
Prototyped and Prototype Device
SK-RT4K-KITTOP
and For prototyping RTAX4000S/SL-CQ352 using RTAX4000S/SLSK-RT4K-CQ352-KITBTM LG1272 package
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
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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.
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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
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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
CQFP to CLGA Adapter Socket
CQ352 to LG1272 Adapter Socket Outline Drawing
Figure 9 • CQ352 to LG1272 Adapter Socket Outline Drawing (unit: mm)
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Reflow Profile
Reflow Profile
Since reflow profile depends upon the size of the board and other components, end users should
perform additional fine tuning from the general profile, as shown in Figure 10.
250
Maximum Package Body
Temperature = 220˚C (±5˚C)
220˚C: 30 seconds maximum
200
180˚C
Temperature (˚C)
150
125
˚C
80
to 1
1˚C to 3˚C
per second
˚C
1˚C to 4˚C
per second
Keep temperature above
183˚C (solder melting point)
for at least 60 seconds
100
120 seconds
minimum
50
0
50
1˚C to 3˚C
per second
100
150
200
250
300
Time (seconds)
Figure 10 • Sample Temperature Profile for I/R or Convection Reflow
Note: This temperature profile guideline is for reference only.
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CQFP to CLGA Adapter Socket
CQ to LG Adapter Pin Mapping List
The CQFP to FBGA adapter is routed from the FBGA package to match the existing die pad available to
the CQFP device that is being prototyped. Contact Microsemi technical support for a detailed mapping
list.
Table 2 • CQFP to FBGA Adapter Pin Mapping List
Adapter
Socket
Ordering Part Number
CQ352 to SK-RT4K-KITTOP and
LG1272 RT4K-CQ352-KITBTM
Prototyped and Prototype Device
SK- For prototyping RTAX4000S/SL-CQ352 using
RTAX4000S/SL-LG1272 package
Adapter Pin Mapping
List Document Number
1-22-11051
Prototyped Product, Adapter, and PCB Design Matrix
Designing the PCB for a specific product requires an understanding of which adapter socket works. Each
adapter socket is routed differently based on the corresponding Axcelerator device (or its radiationtolerant equivalent derivative that is being prototyped) and the commercial Axcelerator FG package used
for prototyping. Table 3 shows the combinations that works.
Table 3 • Prototyping Design Matrix
Prototyped Product
Adapter Part Number
RTAX4000S/SL-CQ352 SK-RT4K-KITTOP
CQ352-KITBTM
and
Prototype Vehicle
SK-RT4K- RTAX4000S/SL-LG1272
PCB Design
RTAX4000S/SL-CQ352
List of Changes
The following table lists critical changes that were made in the current version of the document.
Revision
Changes
Revision 1
Updated Figure Title for Figure 1 (SAR 41790).
(February 2013)
Updated "Support" section.
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Support
Support
Visit Technical Support online at www.microsemi.com/soc/kb/search.aspx.
Technical Support
For Technical Support, email at [email protected]
From North America, call 800.262.1060.
From the rest of the world, call 650.318.4460.
ITAR Technical Support
For technical support on RH and RT FPGAs that are regulated by International Traffic in Arms
Regulations (ITAR), contact via web (Select Yes in the ITAR drop-down list), phone, or email at
www.microsemi.com/soc/mycases.
For ITAR Technical Support, email at [email protected]
From North America, call 888.988.ITAR.
From the rest of the world, call 650.318.4900.
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Microsemi Corporation (NASDAQ: MSCC) offers a comprehensive portfolio of semiconductor
solutions for: aerospace, defense and security; enterprise and communications; and industrial
and alternative energy markets. Products include high-performance, high-reliability analog and
RF devices, mixed signal and RF integrated circuits, customizable SoCs, FPGAs, and
complete subsystems. Microsemi is headquartered in Aliso Viejo, Calif. Learn more at
www.microsemi.com.
Microsemi Corporate Headquarters
One Enterprise, Aliso Viejo CA 92656 USA
Within the USA: +1 (949) 380-6100
Sales: +1 (949) 380-6136
Fax: +1 (949) 215-4996
© 2013 Microsemi Corporation. All rights reserved. Microsemi and the Microsemi logo are trademarks of
Microsemi Corporation. All other trademarks and service marks are the property of their respective owners.
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