cqfp to fbga adapter sockets application noteapplication-notes.digchip.com/056/56-39842.pdf ·...

Application Note AC274

CQFP to FBGAAdapter Sockets

IntroductionRTAX-S/L is Actel's next generation, designed-for-space, metal-to-metal, antifuse Field ProgrammableGate Array (FPGA) family. RTAX-S/L is a derivative of the Axcelerator family, with up to two million systemgates. The FPGA provides the designer with nearly 250 k ASIC gates, with error detection and correction(EDAC) protected static RAM. Actel offers RTAX-S/L in two package styles: the Ceramic Column Grid Array(CCGA), and the Ceramic Quad Flat Pack (CQFP).

Actel developed two low-cost prototyping methods for RTAX-S/L, packaged in CQFP or CCGA, using theAxcelerator family Fine Pitch Ball Grid Array (FBGA) as the prototyping vehicle:

• CQFP to FBGA adapter socket

• CCGA to FBGA adapter socket

This document describes the adapter sockets for the CQFP and the procedure to assemble them.

CQFP to FBGA Adapter SocketsThe CQFP to FBGA adapter sockets have an FBGA configuration on the top and a CQFP configuration onthe bottom. The adapter socket enables customers to use a commercial Axcelerator FG package duringprototyping, then switch to an equivalent CQ352 package for production. There are three CQFP to FBGAadapter sockets available. Their ordering part numbers are listed in Table 1.

Figure 1 on page 2 shows the complete assembly kit. SK-AX1-AX2-KITTOP contains items: (3), (4) and eightscrews from (5). The SK-AX1-CQ352-KITBTM contains items: (1) which is unique for AX1000, (2) and eightscrews from (5). The SK-AX2-CQ352-KITBTM contains items: (1) which is unique for AX2000, (2) and eightscrews plus two alignment pins from (5).

Figure 2 on page 3 shows the top and bottom view of the CQFP to FBGA adapter socket, respectively

Table 1 • Adapter Socket Part Numbers

Adapter Socket Ordering Part Number Prototyped and Prototype Device

CQ352 to FG484 23x23 SK-AX250-CQ352RTFG484S For prototyping RTAX250S/L-CQ352 or AX250-CQ352 usingthe AX250-FG484 package

CQ352 to FG896 SK-AX1-AX2-KITTOP and

SK-AX1-CQ352-KITBTM

For prototyping RTAX2000S/L-CQ352 or AX1000-CQ352using the AX1000-FG896 package


SK-AX1-CQ352-KITBTM

For prototyping RTAX2000S/L-CQ352 or AX2000-CQ352using the AX2000-FG896 package

08/08 1© 2008 Actel Corporation

http://www.actel.com/survey/rating/?f=CQ352-FPGA_Adapter_AN.pdf

CQFP to FBGA

.

Figure 1 • Parts of CQFP to FBGA Adapter Socket: (1) Ceramic Adapter, (2) Socket Housing, (3) Socket Lid, (4) Socket Interposer, (5) Fixing Screws and Alignment Pins

2

CQFP to FBGA

Figure 2 • Ceramic Adapter Top View, Bottom View, and Orientation Drawing

3

CQFP to FBGA

CQFP to FBGA Adapter Socket Assembly Procedure

Step 1Trim and form the CQFP ceramic adapter (Figure 3).

Note: Do NOT solder to the circuit board until housing has been attached, as detailed in step 2 below

Step 2Turn the ceramic adapter and socket housing upside down (Figure 4). Align the adapter A1 corner to thesocket housing notch corner, and fasten the ceramic adapter to the socket housing with the eight screwsprovided (Figure 5 on page 5). Turn the assembly adapter over (Figure 6 on page 5).

Figure 3 • View of Trimmed and Formed CQFP Adapter

Figure 4 • Upside Down View of Ceramic Adapter and Socket Housing

4

CQFP to FBGA

Note: The housing, eight screws, two alignment pins (usage is optional) plus the ceramic adapter form the -KITBTM assembly. The SK-AX1-CQ352-KITBTM contains the unique ceramic adapter for use withAX1000 and the SK-AX2-CQ352-KITBTM contains the unique ceramic adapter for use with theAX2000. The housing is common and is made of black aluminum.

Step 3Reflow the adapter to the printed circuit board (PCB) (Figure 7 on page 6). Since reflow profiles heavilydepend upon the size of the board and its components, perform a reflow process optimization for betterresults. The two alignment pins may optionally be used at this stage, if the PCB has been formed with theadditional alignment holes. See "Alignment Pins" on page 9.

Figure 5 • Illustration of Joining the Adapter to the Socket Housing

Figure 6 • View of Assembled Adapter Socket

5

CQFP to FBGA

.

Step 4Place the socket interposer into the adapter (Figure 8). There is no need to check the interposerorientation.

Figure 7 • Adapter Reflowed to the PCB

Figure 8 • View of Socket Interposer Placement in the Adapter Assembly

6

CQFP to FBGA

Step 5Place the FBGA package into the adapter (Figure 9).

Step 6Place the socket lid on the socket housing and fasten it with the remaining eight screws (Figure 10).

Figure 9 • View of FBGA Package Placement in the Adapter Assembly

Figure 10 • View of Socket Lid and Screw Placement

7

CQFP to FBGA

CQ352 to FG484 23x23 Adapter Socket Outline Drawing

CQ352 to FG896 Adapter Socket Outline Drawing

Figure 11 • CQ352 to FG484 (23x23) Adapter Socket Outline Drawing (unit: mm)

Figure 12 • CQ352 to FG896 Adapter Socket Outline Drawing (unit: mm)

8

CQFP to FBGA

Alignment PinsThere are two alignment pins for aligning the socket housing to the adapter. The same pins can be used toalign the assembled adapter socket to the PCB. Alignment holes on the PCB are optional. You must decidewhether or not to have alignment holes on a board.

Reflow ProfileSince the reflow profile heavily depends upon the size of the board and other components, you mustperform additional fine tuning from the general profile shown in Figure 13.

CQFP to FBGA Adapter Pin Mapping ListThe CQFP to FBGA adapter is routed from the FBGA package to match the existing die pad available forthe CQFP device being prototyped. Table 2 on page 10 includes information on where to download thepin mapping lists.

Note: This temperature profile guideline is for reference only.

Figure 13 • Sample Temperature Profile for Infrared (IR) or Convection Reflow

250

200

150

100

50

Tem

per

atu

re (

˚C)

50 100 150 200 250 3000Time (seconds)1˚C to 3˚C

per second

1˚C to 3˚C per second

1˚C to 4˚C per second

Keep temperature above 183˚C (solder melting point) for at least 60 seconds

180˚C

120 seconds minimum

125˚C to

180˚C

Maximum package body temperature = 220˚C (±5˚C) 220˚C 30 seconds maximum

9

CQFP to FBGA

Prototyped Product, Adapter, and PCB Design MatrixDesigning the PCB for a specific product requires an understanding of which adapter socket will work.Each adapter socket is routed differently. The design is based on the Axcelerator device or its RadTolerantequivalent derivative being prototyped and the commercial Axcelerator FG package used for prototyping.Table 3 shows the combinations that will work.

Table 2 • CQFP to FBGA Adapter Pin Mapping List

Adapter Socket Ordering Part Number

Prototyped and Prototype Device

Adapter Pin Mapping List Document #

CQ352 to FG48423x23

SK-AX250-CQ352RTFG484S For prototyping RTAX250S/L-CQ352 or AX250-CQ352 using AX250-FG484 package

http://www.actel.com/

techdocs/package/default.aspx


SK-AX1-CQ352-KITBTM

For prototyping RTAX1000S/L-CQ352 orAX1000-CQ352 using AX1000-FG896 package


SK-AX2-CQ352-KITBTM

For prototyping RTAX2000S/L-CQ352 orAX2000-CQ352using AX2000-FG896 package

Table 3 • Prototyping Design Matrix

Prototyped Product Adapter Part Number Prototype Vehicle PCB Design

AX250-CQ352 SK-AX250-CQ352RTFG484S AX250-FG484 23x23 AX250-CQ352

AX1000-CQ352 SK-AX1-AX2-KITTOP and

SK-AX1-CQ352-KITBTM

AX1000-FG896 AX1000-CQ352

AX2000-CQ352 SK-AX1-AX2-KITTOP and

SK-AX2-CQ352-KITBTM

AX2000-FG896 AX2000-CQ352

RTAX250S-CQ352,RTAX250SL-CQ352

SK-AX250-CQ352RTFG484S AX250-FG484 23x23 AX250-CQ352 1


SK-AX1-AX2-KITTOP and

SK-AX1-CQ352-KITBTM

AX1000-FG896 AX1000-CQ352 1



SK-AX2-CQ352-KITBTM

AX2000-FG896 AX2000-CQ352 1


SK-AX250-CQ352RTFG484S AX250-FG484 23x23 RTAX250S-CQ352,RTAX250SL-CQ3521, 2

Notes:1. The PCB designer should consider the eight pin pairs of the Phase-locked loop (PLL) analog power supply (VCCPLA/

VCOMPLA, VCCPLB/VCOMPLB, VCCPLC/VCOMPLC, VCCPLD/VCOMPLD, VCCPLE/VCOMPLE, VCCPLF/VCOMPLF, VCCPLG/VCOMPLG, and VCCPLH/VCOMPLH). They should be treated as follows:

• VCCPLA/B/C/D/E/F/G/H —There are eight in each device. VCCPLA supports the PLL associated with global resource HCLKA, and VCCPLB supports the PLL associated with global resource HCLKB. These PLL analog power supply pins should be connected to 1.5 V whether or not the PLL is used. Refer to the Axcelerator Family FPGAs and RTAX-SU Family FPGAs datasheets for pin assignment information.

• VCOMPLA/B/C/D/E/F/G/H —These are compensation reference signals for the internal PLL. There are eight in each device. VCOMPLA supports the PLL associated with global resource HCLKA, and VCOMPLE supports the PLL associated with global resource HCLKE. The VCOMPLX pins should be left floating if the PLL is not being used. Refer to the Axcelerator Family FPGAs and RTAX-S/L Family FPGAs datasheets for pin assignment information.

2. Since the Axcelerator and RTAX-S/L devices are exactly pin-compatible except for the PLL, which RTAX-S/L does nothave, designing the PCB with VCCPL(X) pins connected to 1.5 V will not affect the function of the RTAX-S/L devices. Pinsfor VCOMPL(X) can be designed with land patterns only. These 16 PLL pins are not connected internally inside theRTAX-S packages.

10

http://www.actel.com/techdocs/package/default.aspxhttp://www.actel.com/documents/AX_DS.pdfhttp://www.actel.com/documents/RTAXS_DS.pdfhttp://www.actel.com/documents/AX_DS.pdfhttp://www.actel.com/documents/RTAXS_DS.pdfhttp://www.actel.com/techdocs/package/default.aspx

CQFP to FBGA



SK-AX1-CQ352-KITBTM

AX1000-FG896 RTAX1000S-CQ352,RTAX1000SL-CQ3521, 2



SK-AX2-CQ352-KITBTM

AX2000-FG896 RTAX2000S-CQ352,RTAX2000SL-CQ3521, 2

Table 3 • Prototyping Design Matrix (continued)

Prototyped Product Adapter Part Number Prototype Vehicle PCB Design

Notes:1. The PCB designer should consider the eight pin pairs of the Phase-locked loop (PLL) analog power supply (VCCPLA/

VCOMPLA, VCCPLB/VCOMPLB, VCCPLC/VCOMPLC, VCCPLD/VCOMPLD, VCCPLE/VCOMPLE, VCCPLF/VCOMPLF, VCCPLG/VCOMPLG, and VCCPLH/VCOMPLH). They should be treated as follows:

• VCCPLA/B/C/D/E/F/G/H —There are eight in each device. VCCPLA supports the PLL associated with global resource HCLKA, and VCCPLB supports the PLL associated with global resource HCLKB. These PLL analog power supply pins should be connected to 1.5 V whether or not the PLL is used. Refer to the Axcelerator Family FPGAs and RTAX-SU Family FPGAs datasheets for pin assignment information.

• VCOMPLA/B/C/D/E/F/G/H —These are compensation reference signals for the internal PLL. There are eight in each device. VCOMPLA supports the PLL associated with global resource HCLKA, and VCOMPLE supports the PLL associated with global resource HCLKE. The VCOMPLX pins should be left floating if the PLL is not being used. Refer to the Axcelerator Family FPGAs and RTAX-S/L Family FPGAs datasheets for pin assignment information.

2. Since the Axcelerator and RTAX-S/L devices are exactly pin-compatible except for the PLL, which RTAX-S/L does nothave, designing the PCB with VCCPL(X) pins connected to 1.5 V will not affect the function of the RTAX-S/L devices. Pinsfor VCOMPL(X) can be designed with land patterns only. These 16 PLL pins are not connected internally inside theRTAX-S packages.

11

CQFP to FBGA

List of ChangesThe following table lists critical changes that were made in the current version of the document.

Support Visit Technical Support online at www.actel.com/custsup/search.html.

Email Technical Support at [email protected].

Call Technical Support between 7:00 A.M. and 6:00 P.M Pacific Time, Monday through Friday: (800) 262-1060 or 650-318-4460

Related Documents

DatasheetsAxcelerator Family FPGAs

http://www.actel.com/documents/AX_DS.pdf

RTAX-S RadTolerant FPGAs

http://www.actel.com/documents/RTAXS_DS.pdf

Pin Mapping ListsAll pin mapping lists are available at http://www.actel.com/techdocs/package/default.aspx.

Mechanical Drawings for the Adapter BoardMechanical drawings are available at http://www.actel.com/documents/MechDrwngAdapter.html.

Previous Version Changes in Current Version (55900015-3) Page

55900015-2/7.06 All tables were updated to include current ordering part numbers. 1, 10

Do NOT solder note added to Step 1. 4

Step 3 expanded. 5

Link to pin mapping lists updated. 10, 12

Added link to mechanical drawings. 12

Note: *The part number is located on the last page of the document.‘

12

http://www.actel.com/techdocs/package/default.aspx

http://www.actel.com/documents/MechDrwngAdapter.htmlhttp://www.actel.com/custsup/search.htmlmailto:[email protected]://www.actel.com/documents/AX_DS.pdfhttp://www.actel.com/documents/AX_DS.pdfhttp://www.actel.com/documents/RTAXS_DS.pdfhttp://www.actel.com/documents/RTAXS_DS.pdf

55900015-3/

Actel Corporation

2061 Stierlin CourtMountain View, CA94043-4655USAPhone 650.318.4200Fax 650.318.4600

Actel Europe Ltd.

River Court, Meadows Business ParkStation Approach, BlackwaterCamberley Surrey GU17 9ABUnited KingdomPhone +44 (0) 1276 609 300Fax +44 (0) 1276 607 540

Actel Japan

EXOS Ebisu Building 4F1-24-14 Ebisu Shibuya-kuTokyo 150 JapanPhone +81.03.3445.7671Fax +81.03.3445.7668http://jp.actel.com

Actel Hong Kong

Room 2107, China Resources Building26 Harbour RoadWanchai, Hong KongPhone +852 2185 6460Fax +852 2185 6488www.actel.com.cn

www.actel .com

Actel and the Actel logo are registered trademarks of Actel Corporation.All other trademarks are the property of their owners.

8.08

http://jp.actel.comhttp://www.actel.com.cnhttp://www.actel.com

CQFP to FBGAIntroductionCQFP to FBGA Adapter SocketsCQFP to FBGA Adapter Socket Assembly ProcedureStep 1Step 2Step 3Step 4Step 5Step 6CQ352 to FG484 23x23 Adapter Socket Outline DrawingCQ352 to FG896 Adapter Socket Outline Drawing

Alignment PinsReflow ProfileCQFP to FBGA Adapter Pin Mapping ListList of ChangesSupportRelated DocumentsDatasheetsPin Mapping ListsMechanical Drawings for the Adapter Board