OVERVIEW : DDR4 SDRAM Space Qualified Memory

The DDR4s inherit 3D PLUS’s experience as space memory supplier and manufacturer from SRAM, SDRAM, DDR1, DDR2 to DDR3.

DDR4 SDRAM features higher speed and lower consumption than DDR3 SDRAM. From 16 Gb to 64 Gb, the Radiation Tolerant DDR4 SDRAM modules are organized as x48b or x72b, and with a 1.2 V power supply. Similar to the DDR3 memories, the DDR4s feature an optimized design with decoupling capacitors and termination resistors embedded in the module.  They are offered in BGA package for high resistance Surface Mount (SMT) assembly and withstanding harsh thermal and mechanical environments.

The DDR4 Space Memory Ecosystem

The DDR4 SDRAM products for space applications are used as processing memories alongside the latest processors, FPGAs, in a variety of computer boards. They operate synergistically in an Ecosystem with two additional elements, providing a space qualified DDR4 solution that is unmatched in terms of performances and radiation reliability. The DDR4 memory companion chips are:

• The Radiation Intelligent Memory Controller (RIMC) for DDR4 (3DIPMC0815) is a fully configurable DDR4 SDRAM memory controller designed to work with 3D PLUS DDR4 modules to provide an overall radiation hardened memory solution. This IP core offers Single Event Upset (SEU) and Single Event Functional Interrupt (SEFI) mitigation to DDR4 operating in radiation-hazard environments.
• A radiation hardened by design Termination Regulator DDR4 TR (3DPM0424). This companion chip provides all power requirements for DDR4 VTT bus designs. It reduces power dissipation while dramatically improving signal integrity.

Key features

• 

  Vdd/Vddq= 1.2 V, Vpp = 2.5 V

  Up to 2400 MT/s

• 

  Decoupling capacitors and termination resistors embedded

  Significant board area savings

  Optimized development time and cost

• 

  Ruggedized, fully validated complete DDR4 solution

  Long life cycle products with proven reliability in Space

  No pure tin guarantee

• 

  Radiation tolerance (stand alone):

  TID > 100 krad(Si)

  SEL LET_th > 62.8 MeV.cm²/mg

  SEU LET_th > 2.6 MeV.cm²/mg ;
  σ_sat = 4E-12 cm²/bit

  SEFI LET_th < 2.6 MeV.cm²/mg ;
  σ_sat = 5E-5cm²/device

• 

  Radiation tolerance (w. RIMC DDR4):

  TID > 100 krad (Si)

  SEL LET > 62.8 MeV.cm²/mg

  SEU/SERE/SECE/SEFI mitigation with 3DIPMC0815

• 

  Available in all 3D PLUS screening and qualification options:

  Commercial (C )

  Industrial (I)

  Space qualified (S)

Radiation Tolerant DDR4 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