4 layers304.5 × 217.2 mm
Latest Full Backplane
Trilobyte-CPU/8-bit-computer
A DIY 8-bit computer built mostly with discrete logic chips
478 parts2
4 layers97.3 × 30.7 mm
CPU Instruction Decoder
Trilobyte-CPU/8-bit-computer2A DIY 8-bit computer built mostly with discrete logic chips
- Size
- 97.3 × 30.7 mm
- Copper layers
- 4
- Thickness
- 4.69 mm
- Parts
- 11
- Nets
- 53
- Pads
- 138
- Tracks, vias
- 348, 67
- Pours
- 2
- Routed
- Yes
- KiCad
- KiCad 6 (file 20211014)
- Created
- 20 Apr 2021
- Updated
- 9 Nov 2022
Overview
CPU Instruction Decoder is an open-source printed circuit board by Trilobyte-CPU, from the Trilobyte-CPU/8-bit-computer repository on GitHub. It is a 4-layer board of 97.3 × 30.7 mm with 11 parts on 53 nets, routed with 348 tracks and 67 vias.
It is built around the 74HC245D, 74HC08D and 74HC138. Its parts include 6 ICs, 3 capacitors and 1 connector.
Main components
3
74HC245D
SO-20-300mil-40℃~+125℃ 1 160uA 2V~6V 7.8mA 7.8mA 74HC 8 9ns@4.5V,50pF Bidirectional Tri-State SOIC-20-300mil Buffers, Drivers, Receivers, Transceivers ROHSNexperiaBuffers, Drivers, Receivers, Transceivers
74HC08D
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 Gates
74HC138
SOP-160℃~+70℃ 24ns@5.0V,16pF 2V~6V 3/8 5.2mA 5.2mA 5uA 74HC Decoder Reverse function Single Supply SOP-16 Signal Switches, Multiplexers, Decoders ROHSGRSignal Switches, Multiplexers, Decoders
Parts
11| Qty | Value | Footprint | References |
|---|---|---|---|
| 3 | C | Capacitor_SMD:C_0805_2012Metric | C1, C2, C3 |
| 2 | 74HC08 | Package_SO:SOIC-14_3.9x8.7mm_P1.27mm | U8, U9 |
| 2 | 74HC138 | Package_SO:SOIC-16_3.9x9.9mm_P1.27mm | U6, U10 |
| 2 | 74HC245 | Package_SO:SOIC-20W_7.5x12.8mm_P1.27mm | U1, U4 |
| 1 | Conn_01x32 | Connector_PinHeader_2.54mm:PinHeader_1x32_P2.54mm_Horizontal | J1 |
The 10 most common of 11 parts.
Questions
How big is the CPU Instruction Decoder PCB?
It measures 97.3 × 30.7 mm and has 4 copper layers, 4.69 mm thick.
What parts does the CPU Instruction Decoder use?
11 parts, built around the 74HC245D, 74HC08D and 74HC138. 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 CPU Instruction Decoder KiCad files?
From the Trilobyte-CPU/8-bit-computer repository on GitHub, at the commit this page was made from: the board is PCBs/999-QUEUED-TO-PRINT/Mem-GPR-CPU-Instruction-Decoder/CPU-Instruction-Decoder.kicad_pcb. PCBKit opens the board in the browser, with nothing to install.
Can I use the CPU Instruction Decoder design in my own project?
Its repository states no licence, so its author keeps all rights: ask Trilobyte-CPU before reusing the design.
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