2 layers299.2 × 180 mm
Cobra XP
ceteras/Cobra-XP
Derived from Cobra, an experimental board for testing all kind of mods.
452 parts5MIT
4 layers99.8 × 99.8 mm
Dma mapped memory
jimbro1000/dma-memory-moduleHD6309SBC DMA memory module
- Size
- 99.8 × 99.8 mm
- Copper layers
- 4
- Thickness
- 1.6 mm
- Parts
- 36
- Nets
- 251
- Pads
- 640
- Tracks, vias
- 1,814, 409
- Pours
- 3
- Routed
- Yes
- KiCad
- KiCad 7 (file 20221018)
- Created
- 2 Nov 2023
- Updated
- 4 Nov 2023
Overview
Dma mapped memory is an open-source printed circuit board by jimbro1000, from the jimbro1000/dma-memory-module repository on GitHub. It is a 4-layer board of 99.8 × 99.8 mm with 36 parts on 251 nets, routed with 1,814 tracks and 409 vias.
It is built around the 74LS373SC, 74LS157PC and AS6C8008-55ZIN, with the 74HC21D, 74LS393P-E and 74HC02 among its other parts. Its parts include 29 ICs, 4 capacitors and 3 connectors.
Main components
9
74LS373SC
--55℃~+125℃ 1 2.6mA 24mA 38ns@5V,150pF 4.75V~5.25V 74LS 8 Output enable Tri-State - Buffers, Drivers, Receivers, Transceivers ROHSTexas InstrumentsBuffers, Drivers, Receivers, Transceivers
74LS157PC
PDIP-160℃~+70℃ 4.75V~5.25V Single Supply PDIP-16 Signal Switches, Multiplexers, Decoders ROHSTexas InstrumentsSignal Switches, Multiplexers, Decoders
AS6C8008-55ZIN
TSOPII-44-10.2mm-40℃~+85℃ 2.7V~5.5V 30mA 55ns 6uA 8Mbit TSOPII-44-10.2mm SRAM ROHSAlliance MemorySRAM
74HC21D
SOP-14-40℃~+125℃ 1.5V~4.2V 1.9V、3.98V、4.4V、5.48V、5.9V 100mV、260mV、400mV 19ns@6V,50pF 2 2V~6V 2uA 4 5.2mA 5.2mA 500mV~1.8V 74HC Series AND Gate SOIC-14 Logic Gates ROHSNexperiaGates
74LS393P-E
DIP-14-20℃~+75℃ 2 35MHz 4 4.75V~5.25V 400mW 40ns@5V,15pF 74LS Binary Counter Reset function DIP-14 Counters, Dividers ROHSRenesas ElectronicsCounters, Dividers74HC02
-- Logic Gates ROHSonsemiLogic Gates74HC08D
SOP-14-40℃~+125℃ 1.5V~4.2V 1.9V、3.7V、5.2V 100mV、400mV 2 27ns@4.5V,50pF 2V~6V 2uA 4 5.2mA 5.2mA 500mV~1.8V 74HC Series AND Gate SOIC-14 Logic Gates ROHSNexperiaLogic Gates74LS04PC
PDIP-140℃~+70℃ 4.75V~5.25V 6 6.6mA 74LS PDIP-14 InvertersonsemiInverters74LS74PC
DIP-140ns 0℃~+70℃ 1 2 20MHz 3.5pF 35ns@5V,50pF 4.5ns 4.75V~5.25V 400uA 74LS Series 8mA 8mA Asynchronous Complementary D-Type Rising Edge Set and Reset DIP-14 Flip FlopsTexas InstrumentsFlip Flops
Parts
36| Qty | Value | Footprint | References |
|---|---|---|---|
| 8 | 74LS157 | Package_SO:SOIC-16_3.9x9.9mm_P1.27mm | U7, U8, U9, U10, U11, U12, U13, U14 |
| 4 | 1uF | Capacitor_Tantalum_SMD:CP_EIA-3216-18_Kemet-A_Pad1.58x1.35mm_HandSolder | C1, C2, C3, C4 |
| 4 | 74HC375 | Package_SO:SO-16_3.9x9.9mm_P1.27mm | U26, U27, U28, U29 |
| 4 | AS6C8008-55 | Package_SO:TSOP-II-44_10.16x18.41mm_P0.8mm | U1, U2, U18, U19 |
| 3 | 74HC21 | Package_SO:SO-14_3.9x8.65mm_P1.27mm | U22, U24, U30 |
| 3 | 74LS373 | Package_SO:SOIC-20W_7.5x12.8mm_P1.27mm | U16, U17, U21 |
| 2 | 74LS393 | Package_SO:SOIC-14_3.9x8.7mm_P1.27mm | U5, U6 |
| 2 | Conn_01x02_Male | Connector_PinHeader_2.54mm:PinHeader_1x02_P2.54mm_Vertical | J1, J2 |
| 1 | 74HC02 | Package_SO:SO-14_3.9x8.65mm_P1.27mm | U23 |
| 1 | 74HC08 | Package_SO:SO-14_3.9x8.65mm_P1.27mm | U20 |
| 1 | 74LS04 | Package_SO:SOIC-14_3.9x8.7mm_P1.27mm | U15 |
| 1 | 74LS08 | Package_SO:SOIC-14_3.9x8.7mm_P1.27mm | U4 |
| 1 | 74LS74 | Package_SO:SOIC-14_3.9x8.7mm_P1.27mm | U3 |
| 1 | Conn_02x30_Odd_Even | Connector_PinHeader_2.54mm:PinHeader_2x30_P2.54mm_Vertical | J3 |
Questions
How big is the Dma mapped memory PCB?
It measures 99.8 × 99.8 mm and has 4 copper layers, 1.6 mm thick.
What parts does the Dma mapped memory use?
36 parts, built around the 74LS373SC, 74LS157PC, AS6C8008-55ZIN and 74HC21D. The full list of its parts is on this page, with links to each part's symbol and footprint where PCBKit's library has them.
Where can I download the Dma mapped memory KiCad files?
From the jimbro1000/dma-memory-module repository on GitHub, at the commit this page was made from: the board is dma-mapped-memory.kicad_pcb and its schematic dma-mapped-memory.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Dma mapped memory design in my own project?
Its repository states no licence, so its author keeps all rights: ask jimbro1000 before reusing the design.
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