SRAM SIMM 16MB
About the SRAM SIMM 16MB PCB
SRAM SIMM 16MB is an open source PCB design by codesmythe, published on GitHub under the CERN-OHL-S-2.0 license. It is a 4-layer board measuring 108 × 25.4 mm, with 36 components from 8 distinct parts.
Other key parts include the SamacSys_Parts_72p-SIMM, SN74LVC16245ADGGR, IS66WVE4M16EBLL-70BLI, SN74LVC08APWR and TLV75533PDBV. By type, the board carries 26 capacitors and 10 ICs.
It belongs with the retro computing designs in this gallery.
From the project
A 16MB 72-pin "SRAM SIMM" module that presents a static RAM interface to its host system.
I have designed my own take on a retro Motorola 68000-based single-board computer, as seen here. The original version of the board incorporated one megabyte of memory, a common feature in homebrew 68000 SBCs. I wanted access to more memory for my board, but did not want the complexity of using dynamic RAM or the board space involved in adding more static memory. I came across pseudo-static RAM (PSRAM) chips, specifically the IS66WVE4M16EBLL, which internally function as DRAM but employ an SRAM-style interface to the system. Essentially, these chips contain embedded DRAM controllers. It made…
Main components on the SRAM SIMM 16MB
SRAM SIMM 16MB bill of materials (BOM)
36 components, 8 distinct parts — part numbers from the project's BOM.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | SamacSys_Parts_72p-SIMM | 72p-SIMM | U1 |
| 4 | SN74LVC16245ADGGR | TSSOP-48_6.1x12.5mm_P0.5mm | U2, U3, U4, U5 |
| 2 | IS66WVE4M16EBLL-70BLI | TFBGA-48_6x10mm_Layout6x8_P0.75mm | U6, U7 |
| 2 | SN74LVC08APWR | TSSOP-14_4.4x5mm_P0.65mm | U8, U9 |
| 1 | TLV75533PDBV | SOT-23-5 | U10 |
| 1 | 1UF 1uF | C_0603_1608Metric_Pad1.08x0.95mm_HandSolder | C1 |
| 1 | 4.7UF 4.7uF | C_0603_1608Metric_Pad1.08x0.95mm_HandSolder | C2 |
| 24 | 0.1UF 0.1uF | C_0603_1608Metric_Pad1.08x0.95mm_HandSolder | C3, C4, C5, C6, C7, C8, C9, C10 +16 |
SRAM SIMM 16MB design files
The KiCad project lives in the codesmythe/SRAM_SIMM_16MB repository on GitHub; these links point at the commit this page was built from.
- LayoutSRAM_SIMM_16MB.kicad_pcb
- SchematicSRAM_SIMM_16MB.kicad_sch
- BOMproduction/bom.csv
SRAM SIMM 16MB: common questions
How big is the SRAM SIMM 16MB PCB?
The SRAM SIMM 16MB measures 108 × 25.4 mm, has 4 copper layers and is 1.2 mm thick.
How many components are on the SRAM SIMM 16MB?
36 components, from 8 distinct parts, with part numbers taken from the project's own BOM. The full bill of materials is listed on this page.
Where can I download the SRAM SIMM 16MB design files?
From the codesmythe/SRAM_SIMM_16MB repository on GitHub, which has the KiCad layout, the schematic and the BOM; the links under Design files point to each one.
Can I use the SRAM SIMM 16MB design in my own project?
Yes, under the terms of its CERN-OHL-S-2.0 license, which codesmythe chose for the repository.
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