Application Note AC274 CQFP to FBGA Adapter Sockets Table of Contents Introduction 1 CQFP to FBGA Adapter Sockets . 1 CQFP to FBGA Adapter Socket Assembly Procedure 6 CQ352 to FG484 23x23 Adapter Socket Outline Drawing . 11 CQ352 to FG896 Adapter Socket Outline Drawing . 12 CQ256 to FG896 Adapter Socket Outline Drawing . 13 CQ352 to FG896 Adapter Socket Alignment Pins . 13 Reflow Profile 14 Interposer Insertion Limitations . 14 High Frequency Signals . 15 CQFP to FBGA Adapter Pin Mapping List . 16 Prototyped Product, Adapter, and PCB Design Matrix . 16 List of Changes . 18 Introduction RTAX -S/SL devices are radiation-tolerant FPGAs that offer industry- leading advantages for designers of spaceflight systems. The RTAX-S/SL family is a derivative of the Axcelerator family, with up to two million system gates. The RTAX-S/SL FPGA provides the designer with nearly 250K ASIC gates, with error detection and correction (EDAC) protected static RAM. Microsemi offers the RTAX-S/SL device in two package styles: the ceramic column grid array (CCGA) and ceramic quad flat pack (CQFP). Microsemi has developed four low cost prototyping methods for RTAX-S/SL devices packaged in a CQFP or CCGA, using the Axcelerator family fine pitch ball grid array (FBGA) or ceramic land grid array (LGA) as a prototyping vehicle: CQFP to FBGA adapter socket CQFP to LGA adapter socket CCGA to FBGA adapter socket CCGA to LGA adapter socket This document describes the adapter sockets for the CQFP and the procedure for assembling them. Note: These adapters are intended for developing functional prototypes and are not designed for at-speed testing, especially for sensitive I/Os such as LVDS. The intention of the prototyping adapters is to provide functional validation they may limit the performance of the FPGA. CQFP to FBGA Adapter Sockets The CQFP to FBGA adapter sockets have an FBGA configuration on the top and a CQFP configuration on the bottom. The adapter sockets enable customers to use a commercial Axcelerator FG package during prototyping, and then switch to an equivalent CQ256 or CQ352 package for production. There are four CQFP to FBGA adapter sockets available. Their ordering part numbers are listed in Table 1 on page 2. November 2012 1 2012 Microsemi CorporationCQFP to FBGA Adapter Sockets Table 1 Adapter Socket Part Number Adapter Socket Ordering Part Number Prototyped and Prototype Device CQ352 to FG484 23x23 SK-AX250-CQ352RTFG484S For prototyping RTAX250S/L-CQ352 or AX250-CQ352 using the AX250-FG484 package CQ352 to FG896 SK-AX1-AX2-KITTOP and For prototyping RTAX1000S/L-CQ352 or SK-AX1-CQ352-KITBTM AX1000-CQ352 using the AX1000-FG896 package CQ352 to FG896 SK-AX1-AX2-KITTOP and For prototyping RTAX2000S/L-CQ352 or SK-AX2-CQ352-KITBTM AX2000-CQ352 using the AX2000-FG896 package CQ256 to FG896 SK-AX2-CQ256-KITTOP and For prototyping RTAX2000S/L-CQ256 or SK-AX2-CQ256-KITBTM AX2000-CQ256 using the AX2000-FG896 package Figure 1 shows the CQ352 to FG896 complete assembly kit. SK-A1-AX2-KITTOP contains a socket LID (3), interposer (4), and eight screws (5). SK-AX1-CQ352-KITBTM contains the items: ceramic adapter (1), which is a unique adapter for AX1000, socket housing (2), and eight screws (5). SK-AX2-CQ352- KITBTM contains the following items: ceramic adapter (1), which is unique for AX2000, socket housing (2), and eight screws plus two alignment pins (5). The alignment pins are optional pins to assist in the assembly of the adapter socket. Figure 1 Parts of CQ352 to FG896 Adapter Socket (1) Ceramic Adapter, (2) Socket Housing, (3) Socket Lid, (4) Socket Interposer, (5) Fixing Screws and Alignment Pins 2