Output register
About the Output register PCB
Output register is an open source PCB design by ifilot, published on GitHub under the CERN-OHL-S-2.0 license. It is a 2-layer board measuring 101.6 × 55.9 mm, with 30 components from 20 distinct parts.
Other key parts include the 74HC00, 74HC139, 74HC273, SST39SF040 and D168K. By type, the board carries 10 ICs, 8 capacitors, 6 resistors, 2 connectors, 2 test points and 1 switch.
From the project
Modular 8-bit computer built with TTL logic units to create a "Simple as Possible" system
This project showcases the design and construction of a modular 8-bit computer built with TTL logic units. The core principle behind the project is to create a "Simple as Possible" system, focusing on simplicity, modularity, and compactness.
- TTL Logic-Based Design: The computer is built using traditional TTL (Transistor-Transistor Logic) components, adhering to a fundamental, hands-on approach to computing. - Modular Architecture: Designed for modularity, each functional unit (ALU, registers, memory, control logic, etc.) is implemented as a separate module, allowing for easy debugging…
Main components on the Output register
Output register bill of materials (BOM)
30 components, 20 distinct parts.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | 74HC00 | SO-14_3.9x8.65mm_P1.27mm | U1 |
| 1 | 74HC139 | SO-16_3.9x9.9mm_P1.27mm | U2 |
| 1 | 74HC273 | SOIC-20W_7.5x12.8mm_P1.27mm | U3 |
| 1 | SST39SF040 | PLCC-32_THT-Socket | U4 |
| 4 | D168K | D1X8K | U5, U6, U7, U10 |
| 1 | LM555xM | SOIC-8_3.9x4.9mm_P1.27mm | U8 |
| 1 | 74HC161 | SO-16_3.9x9.9mm_P1.27mm | U9 |
| 1 | SIGNALS | PinHeader_1x10_P2.54mm_Vertical | J1 |
| 1 | BUS | PinHeader_1x10_P2.54mm_Vertical | J2 |
| 1 | SW_DIP_x03 | SW_DIP_SPSTx03_Slide_9.78x9.8mm_W7.62mm_P2.54mm | SW1 |
| 1 | GND | TestPoint_THTPad_D2.0mm_Drill1.0mm | TP1 |
| 1 | CP | TestPoint_THTPad_D2.0mm_Drill1.0mm | TP2 |
| 1 | IN | LED_0805_2012Metric | D1 |
| 6 | C | C_0805_2012Metric | C1, C2, C3, C4, C5, C6 |
| 2 | 10nF | C_0805_2012Metric | C7, C8 |
| 1 | 330 | R_0805_2012Metric | R1 |
| 1 | 1k | R_0805_2012Metric | R2 |
| 1 | 47k | R_0805_2012Metric | R3 |
| 1 | 10k | R_Array_Convex_4x0603 | RN1 |
| 2 | 220 | R_Array_Convex_4x0603 | RN2, RN3 |
Output register design files
The KiCad project lives in the ifilot/sap-smd repository on GitHub; these links point at the commit this page was built from.
Output register: common questions
How big is the Output register PCB?
The Output register measures 101.6 × 55.9 mm, has 2 copper layers and is 1.6 mm thick.
How many components are on the Output register?
30 components, from 20 distinct parts. The full bill of materials is listed on this page.
Where can I download the Output register design files?
From the ifilot/sap-smd repository on GitHub, which has the KiCad layout and the schematic; the links under Design files point to each one.
Can I use the Output register design in my own project?
Yes, under the terms of its CERN-OHL-S-2.0 license, which ifilot chose for the repository.
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