2 layers235 × 77.8 mm
2 layers104.1 × 96.5 mm
RAMBoard
chregu82/ISA_1MB_RAM_Board2DIY 8 Bit ISA Slot RAM Board with 1 Megabyte SRAM for XT machines
- Size
- 104.1 × 96.5 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 30
- Nets
- 112
- Pads
- 314
- Tracks, vias
- 1,363, 41
- Pours
- 2
- Routed
- Yes
- KiCad
- KiCad 5 (file 20171130)
- Created
- 10 Mar 2021
- Updated
- 10 Mar 2021
Overview
RAMBoard is an open-source printed circuit board by chregu82, from the chregu82/ISA_1MB_RAM_Board repository on GitHub, published under the MIT licence. It is a 2-layer board of 104.1 × 96.5 mm with 30 parts on 112 nets, routed with 1,363 tracks and 41 vias.
It is built around the SN74ACT245N, AS6C4008-55PCN and CD74HCT30E, with the SN74HCT138N, SN74HCT02N and SN74LS05N among its other parts. Its parts include 10 capacitors, 9 ICs, 4 resistors, 2 switches and 1 connector.
Main components
6
SN74ACT245N
PDIP-20-40℃~+85℃ 1 24mA 24mA 4.5V~5.5V 74ACT 8 Tri-State PDIP-20 Buffers, Drivers, Receivers, Transceivers ROHSTexas InstrumentsBuffers, Drivers, Receivers, Transceivers
AS6C4008-55PCN
PDIP-320℃~+70℃ 2.7V~5.5V 30mA 4Mbit 4uA 55ns Parallel Port (Parallel) PDIP-32 SRAM ROHSAlliance MemorySRAM
CD74HCT30E
PDIP-14-55℃~+125℃ 1 100mV、260mV 28ns@4.5V,50pF 2V 2uA 3.98V、4.4V 4.5V~5.5V 4mA 4mA 74HCT Series 8 800mV NAND Gate Push-pull TTL Compatible CMOS PDIP-14 Logic Gates ROHSTexas InstrumentsLogic Gates
SN74HCT138N
DIP-16-40℃~+85℃ 17ns@5.5V,50pF 3/8 4.5V~5.5V 4mA 4mA 74HCT 80uA Decoder Single Supply DIP-16 Signal Switches, Multiplexers, Decoders ROHSTexas InstrumentsSignal Switches, Multiplexers, DecodersSN74HCT02N
DIP-14-40℃~+85℃ 18ns@5.5V,50pF 2 2V 2uA 3.7V、4.4V 4 4.5V~5.5V 400mV 4mA 4mA 74HCT Series 800mV NOR Gate DIP-14 Logic Gates ROHSTexas InstrumentsLogic GatesSN74LS05N
PDIP-140℃~+70℃ 1 100uA 2V 32ns@5V,15pF 4.75V~5.25V 6 74LS 800mV 8mA PDIP-14 Inverters ROHSTexas InstrumentsInverters
Parts
30| Qty | Value | Footprint | References |
|---|---|---|---|
| 9 | 100n | Capacitor_THT:C_Disc_D5.0mm_W2.5mm_P2.50mm | C1, C2, C3, C4, C5, C6, C7, C8, C9 |
| 4 | 10K | Resistor_THT:R_Axial_DIN0204_L3.6mm_D1.6mm_P5.08mm_Horizontal | R1, R2, R3, R4 |
| 2 | 10K x 8 | Resistor_THT:R_Array_SIP9 | RN1, RN2 |
| 2 | AS6C4008-55PCN | Package_DIP:DIP-32_W15.24mm | U1, U2 |
| 2 | CD74HCT30E | Package_DIP:DIP-14_W7.62mm | U5, U6 |
| 2 | CONN_1 | HOLE_3MM | HOLE1, HOLE2 |
| 2 | SN74HCT138N | Package_DIP:DIP-16_W7.62mm | U3, U4 |
| 2 | SW_DIP_x08 | Button_Switch_THT:SW_DIP_SPSTx08_Slide_9.78x22.5mm_W7.62mm_P2.54mm | SW1, SW2 |
| 1 | 10u | Capacitor_THT:C_Disc_D5.0mm_W2.5mm_P2.50mm | C10 |
| 1 | Bus_ISA_8bit | RAMBoard:BUS_XT | J1 |
| 1 | SN74ACT245N | Package_DIP:DIP-20_W7.62mm | U7 |
| 1 | SN74HCT02N | Package_DIP:DIP-14_W7.62mm | U9 |
| 1 | SN74LS05N | Package_DIP:DIP-14_W7.62mm | U8 |
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Questions
How big is the RAMBoard PCB?
It measures 104.1 × 96.5 mm and has 2 copper layers, 1.6 mm thick.
What parts does the RAMBoard use?
30 parts, built around the SN74ACT245N, AS6C4008-55PCN, CD74HCT30E and SN74HCT138N. 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 RAMBoard KiCad files?
From the chregu82/ISA_1MB_RAM_Board repository on GitHub, at the commit this page was made from: the board is RAMBoard/RAMBoard.kicad_pcb. PCBKit opens the board in the browser, with nothing to install.
Can I use the RAMBoard design in my own project?
Its repository publishes it under the MIT licence: you may reuse it on that licence's terms (keep the author's notice, and for a copyleft licence share your changes alike).