R Intel® Pentium® 4 Processor 478-Pin Socket (mPGA478) Design Guidelines October 2001 Order Number: 249890-002
Intel® Pentium® 4 Processor 478-Pin Socket (mPGA478) R Information in this document is provided in connection with Intel® products. No license, express or implied, by estoppel or otherwise, to any intellectual property rights is granted by this document.
Intel® Pentium® 4 Processor 478-Pin Socket (mPGA478) R Contents 1. Introduction .................................................................................................................................. 6 1.1. 1.2. 1.3. 2. Assembled Component and Package Description ...................................................................... 7 2.1. 2.2. 3. Objective.......................................................................................................................... 6 Purpose ..
Intel® Pentium® 4 Processor 478-Pin Socket (mPGA478) R 4. Electrical Requirements ............................................................................................................. 16 4.1. 4.2. 4.3. 4.4. 4.5. 4.6. 4.7. 4.8. 4.9. 4.10. 5. Electrical Requirements ................................................................................................ 16 Definitions......................................................................................................................
Intel® Pentium® 4 Processor 478-Pin Socket (mPGA478) R Figures Figure 3-1. Typical Reflow Profile for 63Sn/37Pb solder ......................................................... 14 Figure 4-1. Methodology for Measuring Total Electrical Resistance........................................ 18 Figure 4-2. Methodology for Measuring Electrical Resistance of the Jumper.......................... 18 Figure 4-3. Four Different Jumpers Used in the Package Test Vehicle................................... 19 Figure 4-4.
Intel® Pentium® 4 Processor 478-Pin Socket (mPGA478) R 1. Introduction 1.1. Objective This document defines a surface mount, ZIF (Zero Insertion Force) socket intended for performance and value desktop platforms based on future Intel microprocessors. The socket provides I\O, power and ground contacts. The 478 socket contacts with a cavity in the center of the socket. The socket has solder balls/surface mount features for surface mounting with the motherboard.
Intel® Pentium® 4 Processor 478-Pin Socket (mPGA478) R 2. Assembled Component and Package Description Information provided in this section is to ensure dimensional compatibility of the socket and actuation mechanism with the integrated package assembly. Zero insertion force will be required for placement of the mPGA478 package into the socket prior to actuation. 2.1.
Intel® Pentium® 4 Processor 478-Pin Socket (mPGA478) R 3. Mechanical Requirements 3.1. Mechanical Supports: The socket must carry a load of 45.36Kg, compressive, during the shock and vibration conditions outlined in Section 5. The socket must pass the mechanical shock and vibration and the other use condition requirements listed in Section 5 with the associated heatsink and applicable retention mechanism or simulation thereof in place and with out board support.
Intel® Pentium® 4 Processor 478-Pin Socket (mPGA478) R Proper seating 3.3. Markings 3.3.1. Name mPGA478 (Font size is 8-14 point Bold, Font type is Helvetica) on all development mPGA478 sockets. Manufacturer’s insignia (font size at supplier’s discretion). These marks will be molded or laser marked into the socket housing and must pass Environmental Requirements of Section 5.3 – Solvent Resistance.
Intel® Pentium® 4 Processor 478-Pin Socket (mPGA478) R EDCBA 1 2 3 4 5 3.3.3. Lock (closed) and Unlock (open) Markings For lock an unlock positions on the socket they are to be marked with the universal symbol of the locked and unlocked pictures. Clear indicator marks must be located on the actuation mechanism that identifies the lock (closed) and unlock (open) positions of the cover as well as the actuation direction. These marks should still be visible after a package is inserted into the socket.
Intel® Pentium® 4 Processor 478-Pin Socket (mPGA478) R 3.3.5. Socket Size The mPGA478 Socket must meet the dimensions as shown in Section 8 – Appendix Z.2, including actuation mechanism, allowing insertion of the pins in the socket, without interference between the socket and the pin field. The processor must sit flush on the socket standoffs and the pin field cannot contact the standoffs. The height of the socket in the contact area is 4mm +/- 0.
Intel® Pentium® 4 Processor 478-Pin Socket (mPGA478) R 3.5. Material and Recycling Requirements Cadmium shall not be used in the painting or plating of the socket. CFCs and HFCs shall not be used in manufacturing the socket. It is recommended that any plastic component exceeding 25g must be recyclable as per the European Blue Angel recycling design guidelines. 3.6.
Intel® Pentium® 4 Processor 478-Pin Socket (mPGA478) R 3.12. Solder Ball/Surface Mount Feature True Position The solder balls/surface mount features have a 254 mm diametrical true position requirement with respect to Datum. See Section 8 – Appendix Z.2. 3.13. EMI Tab Socket Requirements The principal functionality of the EMI Tab is a potential locating feature by which the EMI ground frame component could be assembled to the socket prior to heat sink installation.
Intel® Pentium® 4 Processor 478-Pin Socket (mPGA478) R 3.14. Assembly Requirements to the Motherboard 3.14.1. Surface Mountable The socket must be a surface mount socket design. 3.14.2. Reflow Characteristics Max Temperature: 240°C Figure 3-1. Typical Reflow Profile for 63Sn/37Pb solder 3.14.3. Shipping/Handling: Shipping/Handling media needs to support high volume manufacturing. 3.15. Critical To Function Dimensions: The socket shall accept a 478-pin package pin field.
Intel® Pentium® 4 Processor 478-Pin Socket (mPGA478) R Dimension Minimum Nominal Cam Height Above Substrate Shelf (from contact surface to top surface of socket) Socket overall width (X without lever) 1.5 mm 36.8mm 37mm 37.2 mm Socket overall length (Y without lever) Post actuated pin to motherboard pad distance (Y) 45 mm 0.30 mm 0.71 mm Assembled Cover Flatness Cover Standoff height Maximum 0.20 mm 0.25mm 1 0.30mm 1 0.35mm1 Co-planarity Lead / Surface Mount Feature 0.
Intel® Pentium® 4 Processor 478-Pin Socket (mPGA478) R 4. Electrical Requirements In order to meet the performance requirements, the socket must meet the following electrical requirements listed in Table 4-1 – Electrical Requirements. These parameters are determined to be a unique function of the socket geometry and material property and correctly define the socket electrical characteristics.
Intel® Pentium® 4 Processor 478-Pin Socket (mPGA478) R 4.2. Definitions Table 4-2. Electrical Definitions Item 4.3. Parameter Definition 1. Mated loop inductance, Lloop The inductance calculated for two conductors, considering one forward conductor and one return conductor. 2. Maximum mutual capacitance, C Refer to Section 4.2 – Definitions The capacitance between two pins/connectors. 3.
Intel® Pentium® 4 Processor 478-Pin Socket (mPGA478) R Socket contact package Shorting bar Package h ld Package pin +V -V +I -I Motherboard Figure 4-1. Methodology for Measuring Total Electrical Resistance Shorting bar package +V -V +I -I Motherboard Figure 4-2. Methodology for Measuring Electrical Resistance of the Jumper Four types of jumpers (Type A, B1, B2 and PJRC) are used in the Package test vehicle (PTV) and are shown in Figure 4-3 (below).
Intel® Pentium® 4 Processor 478-Pin Socket (mPGA478) R 2B Connecting Trace (T) Pad (P) SRO (S) TYPE A 2B 1BC Connecting Trace (T) Connecting Trace SRO (S) 2B TYPE B 1BC Pad (P) 1BC Connecting Trace (T) Via Pads (S) 2B 1BC Connecting Trace Via Shorting Plane TYPEB Pad (P) on both 2B and 1BC P ad V + C o n n e c tin g T ra c e V - I- I + PJRC Figure 4-3.
Intel® Pentium® 4 Processor 478-Pin Socket (mPGA478) R Multi via Pin Daisy Chain(TypeB2) TypeB1 Type A Figure 4-4. Location of type A, B1, B2 and PJRC daisy chains from pin side of PTV Figure 4-3 – Four Different Jumpers Used in the Package Test Vehicle – shows the top view of the test vehicle (Concho) that will be used for resistance measurement. There are 36 daisy chain configurations on resistance test board. Table 4-3 shows these configurations with the number of pins per each chain and netlist.
Intel® Pentium® 4 Processor 478-Pin Socket (mPGA478) R 25 26 23 24 21 22 19 20 17 18 15 16 13 14 11 12 9 10 7 8 5 6 3 4 1 2 AF AF AE AE AD AD AC AC AA AA W W AB AB Y Y V V U U R R N N L L J J G G T T P P M M K K H H F F E E D D C C A A B B 26 24 25 22 23 20 21 18 19 16 17 14 15 12 13 10 11 8 9 6 7 4 5 2 3 1 Figure 4-5.
Intel® Pentium® 4 Processor 478-Pin Socket (mPGA478) R Table 4-3. Socket Positions Daisy Chained Chain No.
Intel® Pentium® 4 Processor 478-Pin Socket (mPGA478) R Chain No.
Intel® Pentium® 4 Processor 478-Pin Socket (mPGA478) R Chain No.
Intel® Pentium® 4 Processor 478-Pin Socket (mPGA478) R a) These measurements use a 4-wire technique, where the instruments provide two separate circuits. One is a precision current source to deliver the test current. The other is a precision voltmeter circuit to measure the voltage drop between the desired points.
Intel® Pentium® 4 Processor 478-Pin Socket (mPGA478) R Ground Signal Shorting bar on bottom side of the package package interposer Test fixture Test fixture shoulder Figure 4-6. Inductance Measurement Fixture Cross-section mPGA479 Figure 4-7.
Intel® Pentium® 4 Processor 478-Pin Socket (mPGA478) R Shorting bar Figure 4-8. Test fixture mounted bottom view with the pins cut 4.6.1.
Intel® Pentium® 4 Processor 478-Pin Socket (mPGA478) R (d) Check to ensure calibration successfully performed (e) Measure the inductance by probing on the solder ball side of the socket with the test fixture mounted on it. (Figure 4-6 – Inductance Measurement Fixture Cross-section). (i) Call this L socket assembly .
Intel® Pentium® 4 Processor 478-Pin Socket (mPGA478) R measurement configuration. The part that is cut from the top fixture (Figure 4-8 – Test fixture mounted bottom view with the pins cut) and mounted on the socket with the structure for capacitance measurement is shown in Figure 4-11 – Capacitance Measurement Configuration. Capture data at frequency specified in item 6 of Table 4-1 – Electrical Requirements.
Intel® Pentium® 4 Processor 478-Pin Socket (mPGA478) R Rsa Rs R1 R2 R4 R1a R1b R1c signal ground Probe Pad no connect & no pin Figure 4-11. Capacitance Measurement Configuration Configuration R1 Figure 4-12. Capacitance Fixture Design and Measurement Configuration 4.7.1. Procedure for Capacitance Measurements: Measurement equipment and steps in this section are the same as the procedure for inductance measurements in section 0 through step d.
Intel® Pentium® 4 Processor 478-Pin Socket (mPGA478) R 4.8. Dielectric Withstand Voltage No disruptive discharge or leakage greater than 0.5 mA is allowed when subjected to 360 V RMS. The sockets shall be tested according to EIA-364, Test Procedure 20A, Method 1. The sockets shall be tested unmounted and unmated. Barometric pressure shall be equivalent to Sea Level. The sample size is 25 contact-to-contact pairs on each of 4 sockets. The contacts shall be randomly chosen. 4.9.
Intel® Pentium® 4 Processor 478-Pin Socket (mPGA478) R A B C D E F G H K L M N P R T U V W Y AA AB AC AD AE AF 26 26 25 25 24 24 23 23 22 22 21 21 20 20 19 19 18 18 479 Pow wer Region ns 17 16 15 14 17 16 15 14 13 13 12 12 11 11 10 10 9 9 8 8 7 7 6 6 5 5 4 4 3 3 2 2 1 1 A -I B C D E Thermocouple - Figure 4-13.
Intel® Pentium® 4 Processor 478-Pin Socket (mPGA478) R 5. Environmental Requirements Design, including materials, shall be consistent with the manufacture of units that meet the following environmental reference points. The reliability targets in this section are based on the expected field use environment for a desktop product. The test sequence for new sockets will be developed using the knowledge-based reliability evaluation methodology, which is acceleration factor dependent.
Intel® Pentium® 4 Processor 478-Pin Socket (mPGA478) R Use Environment Speculative Stress Condition 7 year life expectation Fast, large gradient on/off to max operating temp.
Intel® Pentium® 4 Processor 478-Pin Socket (mPGA478) R Design, including materials, shall be consistent with the manufacture of units that meet the following safety design guidelines: • UL 1950 most current editions • CSA 950 most current edition • EN60 950 most current edition and amendments • IEC60 950 most current edition and amendments • SEMI S2-93 Product Safety Guidelines most current edition and amendments 6.
Intel® Pentium® 4 Processor 478-Pin Socket (mPGA478) R 7. Appendix Z.1 Figure 7-1.
Intel® Pentium® 4 Processor 478-Pin Socket (mPGA478) R Figure 7-2.
Intel® Pentium® 4 Processor 478-Pin Socket (mPGA478) R Figure 7-3.
Intel® Pentium® 4 Processor 478-Pin Socket (mPGA478) R Figure 7-4.
Intel® Pentium® 4 Processor 478-Pin Socket (mPGA478) R 8. Appendix Z.2 Figure 8-1.
Intel® Pentium® 4 Processor 478-Pin Socket (mPGA478) R Figure 8-2.
