2 layers191.8 × 121.3 mm
8-Bit CPU 32k
slu4coder/Minimal-UART-Computer-1-2
Legacy: Version 1 and 2 of my TTL-only CPU featuring UART I/O, an expansion port, 512KB SSD at up to 10MHz clock speed
109 parts184
2 layers180.3 × 112.4 mm
8-Bit CPU 32k
slowcorners/Minimal-UART-CPU-Dev- Size
- 180.3 × 112.4 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 89
- Nets
- 170
- Pads
- 898
- Tracks, vias
- 0, 0
- Routed
- Not yet
- KiCad
- KiCad 5 (file 20171130)
- Created
- 9 Mar 2021
- Updated
- 9 Mar 2021
Overview
8-Bit CPU 32k is an open-source printed circuit board by slowcorners, from the slowcorners/Minimal-UART-CPU-Dev repository on GitHub. It is a 2-layer board of 180.3 × 112.4 mm with 89 parts on 170 nets.
It is built around the 74HC245D, 74HC161S and 74HC173D, with the 74HC00D, 74HC08D and 74HC165D among its other parts. Its parts include 45 ICs, 25 capacitors, 13 resistors, 3 connectors and 2 switches. It belongs with the retro computing and games boards of this library.
Main components
12
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
74HC161S
SOP-160℃~+70℃ 20MHz 2V~6V 4 500mW Asynchronous Hexadecimal Counter Rising Edge Synchronous Up Counter SOP-16 Counters, Dividers ROHSGRCounters, Dividers74HC173D
SOIC-16-40℃~+125℃ 1 2V~6V 3.5pF 30ns@6V,50pF 4 4uA 7.8mA 7.8mA 74HC Series 95MHz D-Type Reset Rising Edge SOP-16 Flip Flops ROHSNexperiaFlip Flops
74HC00D
SOP-14-40℃~+125℃ 1.5V、3.15V、4.2V 1.9V、3.7V、5.9V 100mV、400mV、400mV 2 2V~6V 4 40uA 5.2mA 5.2mA 500mV~1.8V 74HC Series 7ns@6V,50pF NAND Gate SOIC-14 Logic Gates ROHSNexperiaLogic Gates74HC08D
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
74HC165D
SO-16-40℃~+125℃ 1 28ns@6V,50pF 2V~6V 35MHz 500mW 74HC 8 Parallel or Serial to Serial SOIC-16 Shift Registers ROHSNexperiaShift Registers
74HC283P-E
-- Specialty Logic ROHSRenesas ElectronicsSpecialty Logic74HC86D
SO-14-40℃~+125℃ 1.5V~4.2V 20ns@6V,50pF 2V~6V 2uA 4 5.2mA 5.2mA 500mV~1.8V 74HC Series XOR Gate SOIC-14 Logic Gates ROHSNexperiaLogic Gates74HC02
-- Logic Gates ROHSonsemiLogic Gates74HC04D
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 ROHSNexperiaInverters74HC164
SOP-140℃~+70℃ 1 24ns@5V,16pF 2V~6V 74HC 8 Serial-to-Parallel SOP-14 Shift Registers ROHSGRShift Registers74HC193D
SO-16-40℃~+125℃ 1 18ns@6V 2V~6V 4 49MHz 500mW 74HC Asynchronous Divide-by-2 Reset function、Synchronous counting、Asynchronous parallel load、Multi-mode counting Rising Edge Synchronous Up Counter、Down Counter SO-16 Counters, Dividers ROHSNexperiaCounters / Dividers
Parts
89| Qty | Value | Footprint | References |
|---|---|---|---|
| 20 | 100nF | Capacitor_THT:C_Disc_D5.0mm_W2.5mm_P2.50mm | C1, C2, C3, C4, C5, C10, C11, C12, C13, C14, C15, C16, C17, C18, C19, C20 +4 |
| 11 | 74HC161 | Package_DIP:DIP-16_W7.62mm | U11, U26, U28, U30, U33, U34, U42, U46, U49, U51, U52 |
| 8 | 390 | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R1, R2, R3, R4, R5, R6, R7, R8 |
| 8 | 74HC173 | Package_DIP:DIP-16_W7.62mm | U2, U3, U5, U6, U8, U10, U17, U20 |
| 6 | 74HC245 | Package_DIP:DIP-20_W7.62mm | U4, U15, U23, U41, U50, U53 |
| 4 | 200pF | Capacitor_THT:C_Disc_D5.0mm_W2.5mm_P2.50mm | C21, C22, C23, C24 |
| 4 | 4.7k | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R10, R11, R12, R13 |
| 3 | 74HC00 | Package_DIP:DIP-14_W7.62mm | U35, U44, U48 |
| 2 | 74HC08 | Package_DIP:DIP-14_W7.62mm | U19, U40 |
| 2 | 74HC165 | Package_DIP:DIP-16_W7.62mm | U43, U45 |
| 2 | 74HC283 | Package_DIP:DIP-16_W7.62mm | U13, U14 |
| 2 | 74HC86 | Package_DIP:DIP-14_W7.62mm | U12, U16 |
| 1 | 1k | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R9 |
| 1 | 47µF | Capacitor_THT:CP_Radial_D7.5mm_P2.50mm | C52 |
| 1 | 74HC02 | Package_DIP:DIP-14_W7.62mm | U18 |
| 1 | 74HC04 | Package_DIP:DIP-14_W7.62mm | U1 |
| 1 | 74HC164 | Package_DIP:DIP-14_W7.62mm | U39 |
| 1 | 74HC193 | Package_DIP:DIP-16_W7.62mm | U37 |
| 1 | 74HC590 | Package_DIP:DIP-16_W7.62mm | U21 |
| 1 | ACO-7.3728MHz | Oscillator:Oscillator_DIP-14 | X1 |
| 1 | BANK SELECT | Button_Switch_THT:SW_DIP_SPSTx04_Slide_9.78x12.34mm_W7.62mm_P2.54mm | SW2 |
| 1 | CLOCK | Connector_PinHeader_2.54mm:PinHeader_1x08_P2.54mm_Vertical | J2 |
| 1 | CY62256 32k RAM | Package_DIP:DIP-28_W15.24mm | U32 |
| 1 | RESET | Button_Switch_THT:SW_PUSH_6mm | SW1 |
| 1 | SELECT | Connector_PinHeader_2.54mm:PinHeader_1x08_P2.54mm_Vertical | J3 |
| 1 | SST39SF010A LSB | Package_DIP:DIP-32_W15.24mm_Socket | U9 |
| 1 | SST39SF010A MSB | Package_DIP:DIP-32_W15.24mm_Socket | U7 |
| 1 | SST39SF040A ROM | Package_DIP:DIP-32_W15.24mm_Socket | U31 |
| 1 | UART | Connector_PinSocket_2.54mm:PinSocket_1x06_P2.54mm_Vertical | J1 |
Questions
How big is the 8-Bit CPU 32k PCB?
It measures 180.3 × 112.4 mm and has 2 copper layers, 1.6 mm thick.
What parts does the 8-Bit CPU 32k use?
89 parts, built around the 74HC245D, 74HC161S, 74HC173D and 74HC00D. 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 8-Bit CPU 32k KiCad files?
From the slowcorners/Minimal-UART-CPU-Dev repository on GitHub, at the commit this page was made from: the board is KiCAD/Minimal UART CPU 512K SSD/8-Bit CPU 32k.kicad_pcb. PCBKit opens the board in the browser, with nothing to install.
Can I use the 8-Bit CPU 32k design in my own project?
Its repository states no licence, so its author keeps all rights: ask slowcorners before reusing the design.
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