Overview: Radiation Tolerant DDR2 SDRAM Space Memory

3D PLUS DDR2 SDRAM is an improved DDR Memory with higher speed and lower power consumption than DDR SDRAM. From 1 Gb to 8 Gb, our Radiation Tolerant DDR2 SDRAM space memory are organized as x8b, x48b or x72b and with a 1.8 V power supply. 3D PLUS DDR2 memories embed decoupling capacitors for excellent signal integrity and additional real estate savings on the users’ PCBs. They are offered in SOP or BGA package for high resistance Surface Mount (SMT) assembly and withstanding harsh thermal and mechanical environments.

First released in 2012, 3D PLUS DDR2 SDRAM products are used as fast processor’s RAM in a variety of high performance computer boards. They operate synergistically in an Ecosystem with two additional elements, providing  all-in-one, fully space qualified and radiation immune DDR2 memory solution. The DDR2 memory companion chips are:

• The Radiation Intelligent Memory Controller (RIMC) for DDR2 (3DIPMC0700) is a fully configurable DDR2 SDRAM space memory controller designed to work with 3D PLUS DDR2 modules to provide an overall radiation hardened memory solution. This IP core offers Single Event Upset (SEU) mitigation and Single Event Functional Interrupt (SEFI) protection to DDR2 operating in radiation-hazard environments.
• A radiation hardened by design Termination Regulator DDR2 TR (3DPM0237). It provides enhanced termination and impedance adaptation, dramatically improving signal integrity.

3D PLUS DDR2 have been use in diverse missions such as: Mars 2020, and others.

Key features

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  Highest density – smallest footprint (more than 85 % space savings in the design)

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  Decoupling capacitors and termination resistors embedded

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  High speed up to 667 MT/s

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  Radiation tolerance (stand alone):

  TID > 100 krad(Si)

  SEL LET_th > 68 MeV.cm²/mg

  SEU LET_th : 2.4 MeV.cm²/mg ;
  σ_sat = 5.6E-11 cm²/bit

  SEFI LET_th > 4.8 MeV.cm²/mg ;
  σ_sat = 4.5E-5 cm²/device

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  Radiation tolerance (w. RIMC DDR2):

  TID > 100 krad (Si)

  SEL LET_th > 68 MeV.cm²/mg

  SEU/SERE/SECE/SEFI mitigation with 3DIPMC0700

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  Space quality level

  No pure tin guarantee (less than 97% tin guarantee)

  Very long life time electronics (technology proven for 15 to 18 years missions in space)

  Worldwide delivery guarantee

DDR2 SDRAM Space Memory Line Up

Each 3D PLUS standard product and SiP solution are defined by a specific part number based on the part number decoder provided below. The ordering information consist as a minimum of the following 3 items for fully define a product:

• The product’s Part Number
• The temperature range
• The screening level

For High Reliability products or SiPs for Aerospace applications, a Source Control Drawing (SCD#) referenced 3DPA-xxxx is available for each product. It shall be used for its procurement in addition to other ordering information.
 
Memory Part Number Decoder

Design Tools

1 Gb

2 Gb

4 Gb

6 Gb

8 Gb