SPI Unit
About the SPI Unit PCB
SPI Unit is an open source PCB design by oberrow, published on GitHub under the MIT license. It is a 4-layer board measuring 96 × 70 mm, with 29 components from 15 distinct parts.
Other key parts include the 74LS10, 74LS08, 74HC563, 74LS139 and 74HC165. By type, the board carries 13 capacitors, 12 ICs, 2 connectors and 2 resistors.
It belongs with the dev boards & breakouts designs in this gallery.
From the project
Code for an i8088-based non-PC compatible breadboard computer
Main components on the SPI Unit
SPI Unit bill of materials (BOM)
29 components, 15 distinct parts.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | 74LS10 | DIP-14_W7.62mm | U1 |
| 1 | 74LS08 | DIP-14_W7.62mm | U2 |
| 1 | 74HC563 | DIP-20_W7.62mm | U3 |
| 1 | 74LS139 | DIP-16_W7.62mm | U4 |
| 1 | 74HC165 | DIP-16_W7.62mm | U5 |
| 1 | 74LS163 | DIP-16_W7.62mm | U6 |
| 1 | 74HC595 | DIP-16_W7.62mm | U7 |
| 1 | LMC555xN | DIP-8_W7.62mm | U8 |
| 2 | 74LS541 | DIP-20_W7.62mm | U9, U12 |
| 1 | 74LS126 | DIP-14_W7.62mm | U10 |
| 1 | 74LS540 | DIP-20_W7.62mm | U11 |
| 1 | Conn_01x28 | PinHeader_2x14_P2.54mm_Vertical | J1 |
| 1 | Conn_01x10 | PinHeader_1x10_P2.54mm_Vertical | J2 |
| 13 | C | C_Disc_D5.0mm_W2.5mm_P2.50mm | C1, C2, C3, C4, C5, C6, C7, C8 +5 |
| 2 | R | R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R1, R2 |
SPI Unit design files
The KiCad project lives in the oberrow/i8088-computer repository on GitHub; these links point at the commit this page was built from.
SPI Unit: common questions
How big is the SPI Unit PCB?
The SPI Unit measures 96 × 70 mm, has 4 copper layers and is 1.6 mm thick.
How many components are on the SPI Unit?
29 components, from 15 distinct parts. The full bill of materials is listed on this page.
Where can I download the SPI Unit design files?
From the oberrow/i8088-computer repository on GitHub, which has the KiCad layout and the schematic; the links under Design files point to each one.
Can I use the SPI Unit design in my own project?
Yes, under the terms of its MIT license, which oberrow chose for the repository.
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