SK-AX1-AX2-KITTOP - Microsemi

Application Note AC274

November 2012 1

CQFP to FBGA Adapter Sockets

Table of Contents

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

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

CQFP to FBGA Adapter Sockets

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.

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

SK-AX1-CQ352-KITBTM

For prototyping RTAX1000S/L-CQ352 or

AX1000-CQ352 using the AX1000-FG896

package

CQ352 to FG896 SK-AX1-AX2-KITTOP and

SK-AX2-CQ352-KITBTM

For prototyping RTAX2000S/L-CQ352 or

AX2000-CQ352 using the AX2000-FG896

package

CQ256 to FG896 SK-AX2-CQ256-KITTOP and

SK-AX2-CQ256-KITBTM

For prototyping RTAX2000S/L-CQ256 or

AX2000-CQ256 using the AX2000-FG896

package

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

CQFP to FBGA Adapter Sockets

Figure 2 shows the CQ352 to FG484 complete assembly kit. SK-AX250-CQ352RTF484S contains a

socket lid (3), interposer (4), and sixteen screws (5).

Figure 3 shows the CQ256 to FG896 complete assembly kit. SK-AX2-CQ256-KITTOP contains items

socket LID (3), interposer(4), and eight screws from (5). The SK-AX2-CQ256-KITBTM contains the

following items: ceramic adapter (1), which is unique for RT/AX2000, socket housing (2), and eight

screws from (5).

Figure 2 • Parts of CQ256 to FG896 Adapter Socket; (1) Ceramic Adapter, (2) Socket Housing,

(3) Socket Lid, (4) Socket Interposer, (5) Fixing Screws

Figure 3 • RTAX2000S CQ256 to FG896 Ceramic Adapter, Top View and Bottom View and

Orientation Drawings

CQFP to FBGA Adapter Sockets

Figure 4 shows the top view, and bottom view, and orientation view of the RTAX2000S CQ352 to FG896

adapter.

Figure 5 shows the top view, bottom view, and orientation view of the RTAX1000S CQ352 to FG896

adapter.

Figure 4 • RTAX2000S CQ352 to FG896 Adapter Top View, Bottom View and Orientation Drawing

Figure 5 • RTAX1000S CQ352 to FG896 Adapter Top View, Bottom View and Orientation Drawing

(1.00X45°)

CHAMFER 352

(0.50X45°)

CHAMFER

265

264

176

177

Top View Bottom View

RTAX2000S (or AX2000) CQ352 to AX2000 FG896 Adapter Top View and Bottom View Drawing

INDEX (Pin 1) MARK

265

264

(1.00X45°)

CHAMFER 352

(0.50X45°)

CHAMFER

176

177

INDEX (Pin 1) MARK

Top View Bottom View

RTAX1000S (or AX1000) CQ352 to AX2000 FG896 Adapter Top View and Bottom View Drawing

P/N LOGO ("1" is not an index mark)

P/N LOGO

CQFP to FBGA Adapter Sockets

Figure 6 shows the top view, bottom view, and orientation view of the RTAX250S CQ352 to FG484 23x23

adapter.

Figure 7 shows the top view, bottom view, and orientation view of the RTAX2000S CQ256 to FG896

adapter.

Figure 6 • RTAX250S CQ352 to FG484 Adapter Top View, Bottom View and Orientation Drawing

Figure 7 • RTAX2000S CQ256 to FG896 Adapter Ceramic Adapter Top View and Bottom View

(1.00X45°)

CHAMFER 352

(0.50X45°)

CHAMFER

265

264

176

177

INDEX (Pin 1) MARK

Top View Bottom View

RTAX250S (or AX250) CQ352 to AX250 FG896 Adapter Top View and Bottom View Drawing

P/N LOGO

LOG O M A RK

Top View Bottom View

RTA X 2000S (or AX2000) CQ256 t o A X 2000 FG896 A da pter T o p View and B otto m View Dra w ing

Pin 1 corn er

(1.00X45º)

CHAMFER

Pin 1 corn er

(1.00X45º)

CHAMFER

256 256

LEA D No . 1 LEA D No . 1

CQFP to FBGA Adapter Sockets

CQFP to FBGA Adapter Socket Assembly Procedure

Step 1

Trim and Form the CQFP Ceramic Adapter.

Notes:

1. Do NOT solder adapter to the circuit board until housing has been attached, as detailed in step 2

below.

2. The shape of the CQ256 to FG896 adapter leads after trim and form is different from those of the

CQ352 to FG896 adapter and CQ352 to FG484 23x23. Refer to Figure 8.

Figure 9 shows CQ352 to FG896 adapter trim and form.

Figure 10 and Figure 11 on page 7 show CQ256 to FG896 adapter trim and form.

Figure 8 • CQ256 to FG896 Adapter Leads vs. CQ352 to FG896 Adapter or CQ352 to FG484 23x23 Adapter

Leads after Trim and Form

CQ 256 to FG 896 A dapt er Lea ds

after T rim and Form

CQ 352 to FG484 23 × 23 A da pter o r

CQ352 to FG896 Adapter Leads

after T rim and Form

Figure 9 • CQ352 to FG896 Adapter View of Before and After Trimmed and Formed

Figure 10 • CQ256 to FG896 Adapter View of Before and After Trimmed and Formed

CQFP to FBGA Adapter Socket Assembly Procedure

Step 2

Assemble Socket Housing to Adapter (Torque Limit Screw Driver Not Required)

For the CQ352 to FG896 adapter, turn the ceramic adapter and socket housing upside down (Figure 12).

Figure 11 • CQ256 to FG896 Adapter View of Before and After Trimmed and Formed (photo)

Figure 12 • Upside Down View of CQ352 to FG896 Ceramic Adapter and Socket Housing

CQFP to FBGA Adapter Sockets

Align the adapter A1 corner to the socket housing notch corner, and fasten the ceramic adapter to the

socket housing with the eight screws provided (Figure 13).

Turn the assembly adapter over (Figure 14).

Note: The housing, eight screws, two alignment pins (usage is optional) plus the ceramic adapter form the

KITBTM assembly.

Figure 13 • Illustration of Joining the CQ352 to FG896 Adapter to the Socket Housing

Figure 14 • View of Assembled CQ352 to FG896 Adapter Socket with Socket Housing

CQFP to FBGA Adapter Socket Assembly Procedure

For the CQ256 to FG896 adapter, step 2 is to assemble the socket housing on the ceramic adapter.

Refer to Figure 15.

Step 3

Reflow the Adapter to the PCB (Figure 16).

Note: Since reflow profiles depend heavily upon the size of the board and its components, perform reflow

process optimization for better results.

Figure 15 • View of Assembled CQ256 to FG896 Adapter with Socket Housing

Figure 16 • Reflow the Adapter to PCB

CQFP to FBGA Adapter Sockets

Step 4

Place the Socket Interposer into the Adapter.

Step 5

Place the FBGA Package into the Adapter.

Figure 17 • Place the Socket Interposer into Adapter Assembly

Figure 18 • Place FBGA Package into Adapter Assembly

CQ352 to FG484 23x23 Adapter Socket Outline Drawing

Step 6

Place and tighten the socket lid on the socket housing with the remaining eight screws. A torque limit

screw driver is not required.

CQ352 to FG484 23x23 Adapter Socket Outline Drawing

Figure 19 • Place and Tighten Socket Lid Using Eight Screws and Optional Alignment Pins

Figure 20 • CQ352 to FG484 (23x23) Adapter Socket Outline Drawing (unit: mm)

FG4842

3x23

AX250

FG484 23x23

AX250

2.03

0.15

3.03

50.5 0.18

43.5

CQ352 to FG484 23x23 Adapter

Before Trim and Form

CQ352 to FG484 23x23 Adapter

After Trim and Form and Assembly

54.05 Square

by Fancort Inc

trim & form tool

0.25 by Fancort Inc

trim & f orm tool

14.03

CQFP to FBGA Adapter Sockets

CQ352 to FG896 Adapter Socket Outline Drawing

Figure 21 • CQ352 to FG896 Adapter Socket Outline Drawing (unit: mm)

2.03

0.15

3.03

73.98

50.5 0.18

43.5

CQ352 to FG896 Adapter

Before Trim and Form

CQ352 to FG896 Adapter

After Trim and Form and Assembly

54.05 Square

by Fancort Inc

trim & form tool

0.25 by Fancort Inc

trim & f orm tool

14.03

CQ256 to FG896 Adapter Socket Outline Drawing

CQ352 to FG896 Adapter Socket Alignment Pins

There are two optional alignment pins with the CQ352 to FG896 adapter for aligning the socket housing

to the adapter. The same pins can be used to align the assembled adapter socket to the PCB. Alignment

holes on the PCB are optional. Customers must decide whether or not to have alignment holes on a

board.

Figure 22 • CQ256 to FG896 Adapter Socket Outline Drawing (unit: mm)

CQ256 to FG896 Adapter Socket

After Trim and Form and Assembly

CQ256 to FG896 Adapter Before Trim and Form

CQFP to FBGA Adapter Sockets

Reflow Profile

Since the reflow profile depends upon the size of the board and other components, you need to perform

additional fine tuning from the general profile shown in Figure 23.

Interposer Insertion Limitations

The prototyping adapter sockets are designed to enable the validation and functional testing of the user

FPGA designs on commercial devices before programming the design on the intended hermetic units.

The interposer is typically used for a limited number of insertions (no more than 25 insertions) per user

design/application. Additionally, the interposer is not intended for long term compression of the

commercial prototype unit. The maximum duration for which the interposer should remain compressed is

10 days per insertion. The prototyping adapter sockets can only withstand the temperature range of

–25ºC to +125ºC. In the event that the socket is used in ways that exceed the intended use model

(examples are temperatures exceeding 125ºC, high current, long mating duration exceeding 10 days, or

a combination of all), there is a possibility of interposer damage or dislodging pins from the interposer, as

shown in Figure 24 on page 15.

Figure 23 • Sample Temperature Profile for I/R or Convection Reflow

250

200

150

100

Temperature (°C)

50 100 150 200 250 3000

Time (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

Note: This temperature profile guideline is for reference only

High Frequency Signals

Possible solutions for interposers with dislodged pins are listed below:

For five or fewer dislodged pins, fix them by putting the dislodged pins back into the interposer using

tweezers.

Otherwise a damaged interposer should be replaced with a new interposer.

Lastly, when replacing a damaged interposer, note that the specific interposer for the prototyping adapter

socket must be used. The interposer for the CQ352 to FG484 socket is different from the interposer used

with the CQ352 to FG896 socket and also different from the interposer used with the CQ256 to FG896

socket.

High Frequency Signals

The adapter socket was built for functional prototyping only. It was not the intended to support at-speed

testing, especially for high frequency signals such as LVDS. There is no specific series or parallel

termination on the adapter board itself. To operate high frequency signals with the adapter socket, the

series and parallel termination should be placed close to the I/O pins. The only possible location is on the

main board, which is too distant from I/O pins and will also add significantly to the parasitic. If you need to

implement LVDS or higher frequency signals, you must build a standalone board.

Figure 24 • Pin Dislodged from Interposer

CQFP to FBGA Adapter Sockets

CQFP to FBGA Adapter Pin Mapping List

The CQFP to FBGA adapter is routed from the FBGA package to match the existing die pad available for

the CQFP device being prototyped. Table 2 includes information on where to download the pin mapping

lists.

Prototyped Product, Adapter, and PCB Design Matrix

Designing 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

RadTolerant equivalent 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 FG484

23x23

SK-AX250-CQ352RTFG484S For prototyping RTAX250S/L-CQ352 or

AX250-CQ352 using the AX250-FG484

package

Refer to the Prototyping

Solutions section of the

Microsemi SoC Products

Group website:

www.microsemi.com/soc/

techdocs/package/default

.aspx.

CQ352 to FG896 SK-AX1-AX2-KITTOP and

SK-AX1-CQ352-KITBTM

For prototyping RTAX1000S/L-CQ352

or AX1000-CQ352 using the

AX1000-FG896 package

CQ352 to FG896 SK-AX1-AX2-KITTOP and

SK-AX2-CQ352-KITBTM

For prototyping RTAX2000S/L-CQ352

or AX2000-CQ352 using the

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

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-S/SL and RTAX-DSP Radiation-Tolerant 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/SL and RTAX-DSP Radiation-Tolerant 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 not

have, designing the PCB with VCCPL(X) pins connected to 1.5 V will not affect the function of the RTAX-S/L devices.

Pins for VCOMPL(X) can be designed with land patterns only. These 16 PLL pins are not connected internally inside the

RTAX-S packages.

Prototyped Product, Adapter, and PCB Design Matrix

RTAX1000S-CQ352,

RTAX1000SL-CQ352

SK-AX1-AX2-KITTOP and

SK-AX1-CQ352-KITBTM

AX1000-FG896 AX1000-CQ352

RTAX2000S-CQ352,

RTAX2000SL-CQ352

SK-AX1-AX2-KITTOP and

SK-AX2-CQ352-KITBTM

AX2000-FG896 AX2000-CQ352 1

RTAX250S-CQ352,

RTAX250SL-CQ352

SK-AX250-CQ352RTFG484S AX250-FG484 23x23 RTAX250S-CQ352,

RTAX250SL-CQ3521, 2

RTAX1000S-CQ352,

RTAX1000SL-CQ352

SK-AX1-AX2-KITTOP and

SK-AX1-CQ352-KITBTM

AX1000-FG896 RTAX1000S-CQ352,

RTAX1000SL-CQ3521, 2

RTAX2000S-CQ352,

RTAX2000SL-CQ352

SK-AX1-AX2-KITTOP and

SK-AX2-CQ352-KITBTM

AX2000-FG896 RTAX2000S-CQ352,

RTAX2000SL-CQ3521, 2

Table 3 • Prototyping Design Matrix (continued)