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 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 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 CQFP to CLGA Adapter Socket CQ352 to LG1272 Adapter Socket Outline Drawing Figure 9 • CQ352 to LG1272 Adapter Socket Outline Drawing (unit: mm) 6 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. 7 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. 8 Page 2 9 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. 9 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. 51900210-1/2.13