2 layers200 × 300 mm
2 layers200 × 300 mm
Final cu
KN-Breadboard-Computing/computer- Size
- 200 × 300 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 195
- Nets
- 474
- Pads
- 1,372
- Tracks, vias
- 3,665, 331
- Pours
- 2
- Routed
- Yes
- KiCad
- KiCad 8.0 (file 20240108)
- Created
- 30 Nov 2022
- Updated
- 11 Jul 2025
Overview
Final cu is an open-source printed circuit board by KN-Breadboard-Computing, from the KN-Breadboard-Computing/computer repository on GitHub. It is a 2-layer board of 200 × 300 mm with 195 parts on 474 nets, routed with 3,665 tracks and 331 vias.
It is built around the SN74AC245N, DS1013-20SSIB1-B-0 and AT28C64B-15PU, with the CD4081BEE4, SN74HC574N and CD4071BEE4 among its other parts.
Main components
9
SN74AC245N
PDIP-20-40℃~+85℃ 1 24mA 24mA 2V~6V 3.5ns@5V,50pF 40uA 74AC 8 Bidirectional Tri-State PDIP-20 Buffers, Drivers, Receivers, Transceivers ROHSTexas InstrumentsBuffers, Drivers, Receivers, Transceivers
DS1013-20SSIB1-B-0
插件,P=2.54mm-40℃~+105℃ 10 2 2.54mm 2.54mm 2x10P 3A Black Gold IDC Header Through Hole 插件,P=2.54mm IDC Connectors ROHSCONNFLY ElecIDC Connectors
AT28C64B-15PU
DIP-28-600mil-40℃~+85℃ 10 Years 100,000 cycles 10ms 4.5V~5.5V 64Kbit Hardware write protection function、Software write protection function、Built-in error correction code (ECC) function Parallel Port (Parallel) DIP-28-600mil EEPROM ROHSMicrochip TechnologyEEPROM
CD4081BEE4
PDIP-14-55℃~+125℃ 1.5V 2 250ns@5V,50pF 3.5V 3V~18V 4 4.2mA 4.95V 50mV 6.8mA 7.5uA AND Gate CD4 PDIP-14 Logic Gates ROHSTexas InstrumentsLogic Gates
SN74HC574N
DIP-20-40℃~+85℃ 1 21ns 2V~6V 36MHz 3pF 46ns@6V,150pF 5ns 7.8mA 7.8mA 74HC Series 8 8uA D-Type Enable Rising Edge Tri-State DIP-20 Flip Flops ROHSTexas InstrumentsFlip FlopsCD4071BEE4
PDIP-14-55℃~+125℃ 1.5V 1mA 1mA 2 250ns@5V,50pF 250uA 3.5V 3V~18V 4 4.95V 50mV CD4 OR Gate PDIP-14 Logic Gates ROHSTexas InstrumentsLogic GatesCD74HC04E
PDIP-14-55℃~+125℃ 1.5V~4.2V 1.9V、4.4V、5.9V 14ns@6V,50pF 2V~6V 2uA 5.2mA 5.2mA 500mV~1.8V 6 74HC PDIP-14 Inverters ROHSTexas InstrumentsInverters
CD4043BEE4
PDIP-16-55℃~+125℃ 150ns 20uA 3V~18V 4 6.8mA 6.8mA SR Latch Tri-State PDIP-16 Latches ROHSTexas InstrumentsLatchesCD74HC193E
PDIP-16-55℃~+125℃ 1 29MHz 2V~6V Asynchronous Rising Edge Synchronous Up Counter、Down Counter PDIP-16 Counters, Dividers ROHSTexas InstrumentsCounters, Dividers
README
README.mdElectronics Of 8-bit CPU
Parts
195| Qty | Value | Footprint | References |
|---|---|---|---|
| 60 | R_US | Resistor_THT:R_Axial_DIN0204_L3.6mm_D1.6mm_P7.62mm_Horizontal | R_A0, R_A1, R_A2, R_A3, R_A4, R_A5, R_A6, R_A7, R_A8, R_A9, R_A10, R_A11, R_A12, R_A13, R_A14, R_A15 +44 |
| 53 | LED | LED_THT:LED_D5.0mm_FlatTop | LED_A0, LED_A1, LED_A2, LED_A3, LED_A4, LED_A5, LED_A6, LED_A7, LED_A8, LED_A9, LED_A10, LED_A11, LED_A12, LED_A13, LED_A14, LED_A15 +37 |
| 12 | DS1013-20SSIB1-B-0 | Connector_PinSocket_2.54mm:PinSocket_2x10_P2.54mm_Vertical | IDC-ADDRESS-BUS1, IDC-ADDRESS-BUS2, IDC-ADDRESS-BUS3, IDC-DATA-BUS1, IDC-DATA-BUS2, IDC-DATA-BUS3, IDC-FLAGS1, IDC-INT-DATA-BUS1, IDC-INT-DATA-BUS2, IDC-SIGNALS1, IDC-SIGNALS2, IDC-SIGNALS3 |
| 10 | AT28C64B-15PU | Package_DIP:DIP-28_W15.24mm | EEPROM-BOOT-MEMORY1, EEPROM-FLAG-CHECK1, EEPROM-INTERRUPT-CHECK1, EEPROM-SIGNALS-A1, EEPROM-SIGNALS-B1, EEPROM-SIGNALS-C1, EEPROM-SIGNALS-D1, EEPROM-SIGNALS-E1, EEPROM-SIGNALS-F1, EEPROM-SIGNALS-G1 |
| 9 | CD4081BEE4 | Package_DIP:DIP-14_W7.62mm | AND-GATE-INT1, AND-GATE-INT2, AND-GATE-INT3, AND-GATE-SELECTOR1, AND-GATE-SIGNALS1, AND-GATE-SIGNALS2, AND-GATE-SIGNALS3, ENABLE-INTERRUPTS1, ENABLE-INTERRUPTS2 |
| 9 | SN74HC574N | Package_DIP:DIP-20_W7.62mm | BUFFER-A1, BUFFER-B1, BUFFER-C1, BUFFER-D1, BUFFER-E1, BUFFER-F1, BUFFER-G1, INSTRUCTION-REGISTER1, REG-INT-DATA1 |
| 7 | Conn-1x2 | Connector_PinHeader_2.54mm:PinHeader_1x02_P2.54mm_Vertical | BUTTON-OUT1, SUPPLY-IN1, SUPPLY-OUT1, SUPPLY-OUT2, SUPPLY-OUT3, SUPPLY-OUT4, SUPPLY-OUT5 |
| 5 | C | Capacitor_THT:C_Disc_D3.0mm_W1.6mm_P2.50mm | C2, TIMER1-C1, TIMER1-C2, TIMER2-C1, TIMER2-C2 |
| 5 | SN74AC245N | Package_DIP:DIP-20_W7.62mm | TRNS-BOOT-MEMORY1, TRNS-INT-ADDRESS1, TRNS-INT-ADDRESS2, TRNS-INT-DATA1, TRNS-RAM-MEMORY1 |
| 4 | Conn-1x5 | Connector_PinHeader_2.54mm:PinHeader_1x05_P2.54mm_Vertical | INTERRUPTS-IN1, INTERRUPTS-IN2, INTERRUPTS-OUT1, INTERRUPTS-OUT2 |
| 4 | SW_MEC_5E | Button_Switch_THT:SW_Push_2P1T_Toggle_CK_PVA1xxH1xxxxxxV2 | BOOT-MODE1, BUTTON1, BUTTON1-TIMER2, MASTER-RESET1 |
| 3 | CD4071BEE4 | Package_DIP:DIP-14_W7.62mm | OR-GATE-INT-DATA1, OR-GATE-INT1, OR-GATE-RESETS1 |
| 3 | CD74HC04E | Package_DIP:DIP-14_W7.62mm | NOT-GATE-CLK1, NOT-GATE-INT1, NOT-GATE-SELECTOR1 |
| 3 | C_Polarized_US | Capacitor_THT:CP_Radial_D5.0mm_P2.50mm | C1, TIMER1-C3, TIMER1-C4 |
| 2 | CD4043BEE4 | Package_DIP:DIP-16_W7.62mm | SR-LATCH_INTERRUPTS1, SR-LATCH-INTERRUPTS2 |
| 2 | LMC555xN | Package_DIP:DIP-8_W7.62mm | TIMER1, TIMER2 |
| 2 | SW_DPDT_x2 | Button_Switch_THT:SW_Slide-03_Wuerth-WS-SLTV_10x2.5x6.4_P2.54mm | MODE-SELECTOR-1, MODE-SELECTOR-2 |
| 1 | CD74HC193E | Package_DIP:DIP-16_W7.62mm | MICROCODE-COUNTER1 |
| 1 | LOGO | additional-libraries:bb-logo | G*** |
Questions
How big is the Final cu PCB?
It measures 200 × 300 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Final cu use?
195 parts, built around the SN74AC245N, DS1013-20SSIB1-B-0, AT28C64B-15PU and CD4081BEE4. 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 Final cu KiCad files?
From the KN-Breadboard-Computing/computer repository on GitHub, at the commit this page was made from: the board is schematics/final-cu/final-cu.kicad_pcb and its schematic schematics/arithmetic-logic-unit/arithmetic-logic-unit.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Final cu design in my own project?
Its repository states no licence, so its author keeps all rights: ask KN-Breadboard-Computing before reusing the design.
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