4 layers271.8 × 147.3 mm
2 layers135.9 × 53.3 mm
A board featuring the Motorola 68000
- Size
- 135.9 × 53.3 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 46
- Nets
- 96
- Pads
- 369
- Tracks, vias
- 699, 164
- Pours
- 2
- Routed
- Yes
- KiCad
- KiCad 9.0 (file 20241229)
- Created
- 15 Jul 2025
- Updated
- 20 Sep 2026
Overview
Spi is an open-source printed circuit board by scefrom, from the scefrom/SF68 repository on GitHub. It is a 2-layer board of 135.9 × 53.3 mm with 46 parts on 96 nets, routed with 699 tracks and 164 vias.
It is built around the 74HC541D, 74HC125D and 74HC161S, with the 74HC04D, 74HC153D and 74HC157D among its other parts. Its parts include 15 ICs, 9 resistors, 3 diodes, 3 connectors and 2 capacitors.
Main components
11
74HC541D
SO-20-300mil-40℃~+125℃ 1 12ns@4.5V,50pF 160uA 2V~6V 7.8mA 7.8mA 74HC 8 Output enable Tri-State Unidirectional SO-20-300mil Buffers, Drivers, Receivers, Transceivers ROHSNexperiaBuffers, Drivers, Receivers, Transceivers
74HC125D
SO-14-40℃~+125℃ 1 11ns@4.5V,50pF 160uA 2V~6V 4 7.8mA 7.8mA 74HC Tri-State Unidirectional SOIC-14 Buffers, Drivers, Receivers, Transceivers ROHSNexperiaBuffers, Drivers, Receivers, Transceivers
74HC161S
SOP-160℃~+70℃ 20MHz 2V~6V 4 500mW Asynchronous Hexadecimal Counter Rising Edge Synchronous Up Counter SOP-16 Counters, Dividers ROHSGRCounters, Dividers74HC04D
SOP-14-40℃~+125℃ 1 1.5V~4.2V 1.9V、3.7V、5.2V 100mV、400mV、400mV 14ns@6V,50pF 2V~6V 2uA 5.2mA 5.2mA 500mV~1.8V 6 74HC SOIC-14 Inverters ROHSNexperiaInverters74HC153D
SOIC-16-40℃~+125℃ 160uA 2V~6V 44ns@4.5V,50pF 5.2mA 5.2mA 74HC 8/2 Multiplexer Output enable high-impedance Single Supply SOIC-16 Signal Switches, Multiplexers, Decoders ROHSNexperiaSignal Switches, Multiplexers, Decoders
74HC157D
SO-16-40℃~+125℃ 10ns@6.0V,50pF 160uA 2V~6V 5.2mA 5.2mA 74HC 8/4 Multiplexer Single Supply SOIC-16 Signal Switches, Multiplexers, Decoders ROHSNexperiaSignal Switches / Encoders & Decoders / Multiplexers74HC164
SOP-140℃~+70℃ 1 24ns@5V,16pF 2V~6V 74HC 8 Serial-to-Parallel SOP-14 Shift Registers ROHSGRShift Registers74HC165D
SO-16-40℃~+125℃ 1 28ns@6V,50pF 2V~6V 35MHz 500mW 74HC 8 Parallel or Serial to Serial SOIC-16 Shift Registers ROHSNexperiaShift Registers74HC32D
SOP-14-40℃~+125℃ 1.5V~4.2V 1.9V、4.4V、5.9V 100mV、400mV、400mV 2 2V~6V 2uA 4 5.2mA 5.2mA 500mV~1.8V 6ns@6V,50pF 74HC Series OR Gate SOIC-14 Logic Gates ROHSNexperiaLogic Gates
74HC573
SOP-20-40℃~+85℃ 14ns 1ns 2V~6V 4ns 74HC 8 8uA D Latch Tri-State SOP-20 Latches ROHSHXY MOSFETLatches74HC688D
SOIC-20-300mil-40℃~+125℃ 0.1V 0.5V、1.35V、1.8V 1.2V、2.4V、3.2V 1.9V、4.4V、5.9V 160uA 16ns@6.0V,50pF 2V~5V SOIC-20-300mil Digital Comparators ROHSNexperiaDigital Comparators
Parts
46| Qty | Value | Footprint | References |
|---|---|---|---|
| 9 | 100n | Capacitor_THT:C_Disc_D3.0mm_W1.6mm_P7.62mm | B1, B2, B3, B4, B5, B7, B8, B9, B10 |
| 4 | 10k | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P2.54mm_Vertical | R3, R10, R11, R12 |
| 3 | 100n | Capacitor_THT:C_Disc_D3.0mm_W1.6mm_P2.54mm | B6, B11, B12 |
| 3 | 74HC541 | Package_DIP:DIP-20_W7.62mm | U7, U8, U10 |
| 3 | D_Schottky_Filled | Diode_THT:D_DO-35_SOD27_P2.54mm_Vertical_AnodeUp | D1, D2, D3 |
| 2 | 1k | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P2.54mm_Vertical | R2, R6 |
| 2 | 22pF | Capacitor_THT:C_Disc_D3.0mm_W1.6mm_P2.54mm | C1, C2 |
| 2 | 4k7 | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P2.54mm_Vertical | R5, R9 |
| 2 | 74HC125 | Package_DIP:DIP-14_W7.62mm | U1, U2 |
| 2 | 74HC161 | Package_DIP:DIP-16_W7.62mm | U14, U15 |
| 1 | 10u | Capacitor_THT:CP_Radial_D5.0mm_P2.00mm | B13 |
| 1 | 2k | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P2.54mm_Vertical | R7 |
| 1 | 74HC04 | Package_DIP:DIP-14_W7.62mm | U4 |
| 1 | 74HC153 | Package_DIP:DIP-16_W7.62mm | U5 |
| 1 | 74HC157 | Package_DIP:DIP-16_W7.62mm | U12 |
| 1 | 74HC164 | Package_DIP:DIP-14_W7.62mm | U3 |
| 1 | 74HC165 | Package_DIP:DIP-16_W7.62mm | U13 |
| 1 | 74HC32 | Package_DIP:DIP-14_W7.62mm | U6 |
| 1 | 74HC573 | Package_DIP:DIP-20_W7.62mm | U9 |
| 1 | 74HC688 | Package_DIP:DIP-20_W7.62mm | U11 |
| 1 | LOGO | LOGO | G*** |
| 1 | perslot1a | Connector_PCBEdge:edge_connector_30p_2.54mm | J3 |
| 1 | perslot1b | Connector_PCBEdge:edge_connector_15p_2.54mm | J2 |
| 1 | spi-port | Connector_IDC:IDC-Header_2x05_P2.54mm_Horizontal | J1 |
Questions
How big is the Spi PCB?
It measures 135.9 × 53.3 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Spi use?
46 parts, built around the 74HC541D, 74HC125D, 74HC161S and 74HC04D. 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 Spi KiCad files?
From the scefrom/SF68 repository on GitHub, at the commit this page was made from: the board is spi/spi.kicad_pcb and its schematic SF68.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Spi design in my own project?
Its repository states no licence, so its author keeps all rights: ask scefrom before reusing the design.
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