6 layers313 × 259.5 mm
Open8-vga motherboard
adham404/Open8-VGA
An 8-bit computer from 74HC logic: microcoded CPU, VGA, PS/2, on-board editor and assembler. Play it in your browser.
322 parts3MIT
2 layers238.8 × 120.6 mm
Td4
unyacat/td41渡波郁著「CPUの創りかた」を独自に起こした基板
- Size
- 238.8 × 120.6 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 252
- Nets
- 242
- Pads
- 930
- Tracks, vias
- 1,608, 310
- Pours
- 1
- Routed
- Yes
- KiCad
- KiCad 8.0 (file 20240108)
- Created
- 26 Jan 2025
- Updated
- 26 Jan 2025
Overview
Td4 is an open-source printed circuit board by unyacat, from the unyacat/td4 repository on GitHub. It is a 2-layer board of 238.8 × 120.6 mm with 252 parts on 242 nets, routed with 1,608 tracks and 310 vias.
It is built around the CD74HC540E, 74HC138 and CD74HC153E, with the 74HC14, CD74HC10E and CD74HC283E among its other parts. Its parts include 152 diodes, 42 resistors, 20 switches, 17 capacitors and 14 ICs.
Main components
8
CD74HC540E
PDIP-20-55℃~+125℃ 1 160uA 2V~6V 7.8mA 7.8mA 74HC 8 9ns@5V,15pF Tri-State PDIP-20 Buffers, Drivers, Receivers, Transceivers ROHSTexas InstrumentsBuffers, Drivers, Receivers, Transceivers
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
CD74HC153E
PDIP-16-55℃~+125℃ 27ns@6V,50pF 2V~6V 5.2mA 5.2mA 74HC 8uA Single Supply PDIP-16 Signal Switches, Multiplexers, Decoders ROHSTexas InstrumentsSignal Switches, Multiplexers, Decoders
74HC14
SOP-14-40℃~+85℃ 1.9V、3.98V、4.4V、5.48V、5.9V 100mV、260mV、260mV 20uA 25ns@4.5V,50pF 2V~6V 6 74HC Noise suppression function Schmitt trigger SOP-14 Inverters ROHSJSMSEMIInverters
CD74HC10E
PDIP-14-55℃~+125℃ 1.5V~4.2V 17ns@6V,50pF 2V~6V 2uA 3 5.2mA 5.2mA 500mV~1.8V 74HC Series NAND Gate Push-pull StandardCMOS PDIP-14 Logic Gates ROHSTexas InstrumentsLogic GatesCD74HC283E
DIP-16-55℃~+125℃ 2V~6V 4 Full Adder DIP-16 Specialty Logic ROHSTexas InstrumentsSpecialty LogicCD74HC32E
PDIP-14-55℃~+125℃ 1.5V~4.2V 15ns@6V,50pF 2V~6V 2uA 4 5.2mA 5.2mA 500mV~1.8V 74HC Series OR Gate PDIP-14 Logic Gates ROHSTexas InstrumentsLogic GatesCD74HC74E
DIP-14-55℃~+125℃ 1 10ns 10pF 2 2V~6V 30ns@6V,50pF 3ns 4uA 5.2mA 5.2mA 50MHz 74HC Series Asynchronous Complementary D-Type Rising Edge Set and Reset DIP-14 Flip Flops ROHSTexas InstrumentsFlip Flops
README
README.mdTD4
渡波郁著 CPUの創りかた 独自に起こした基板です。
必要な部品・値段
大まかの目安です。
| 部品 | 個数 | 参考価格 | 内容 | 情報 |
|---|---|---|---|---|
| 74HC10 | 1 | @60 | 3入力NAND回路 | |
| 74HC14 | 1 | @40 | 6回路シュミットトリガーインバータ | |
| 74HC32 | 1 | @30 | 4回路OR | |
| 74HC74 | 1 | @25 | 2回路Dフリップフロップ | |
| 74HC138 | 2 | @30 | 3to8ラインデコーダ | |
| 74HC153 | 2 | @180 | 4chマルチプレクサ | |
| 74HC161 | 4 | @80 | 同期式4ビットカウンタ | |
| 74HC283 | 1 | @220 | 4bit 2進全加算器 | |
| 74HC540 | 1 | @200 | 8bit 3ステートバッファ(反転タイプ) | |
| USB Type-Cコネクタ | 1 | @70 | 電源供給用 | 秋月 |
| スライドスイッチ | 1 | @30 | 2.54mmピッチ | 手動クロックと自動クロックを選択する用 |
| 0.1uF | 14 | 積層セラミックコンデンサ | ICの近くに配置する用 | |
| 10uF | 3 | 無極性電解コンデンサ | 自動クロック・手動クロック・リセット用 | |
| 100Ω | 8 | LED用 | ||
| 1kΩ | 5 | |||
| 5.1kΩ | 2 | Type-Cから5V取る用 | ||
| 10kΩ | 9 | |||
| 33kΩ | 1 | 自動クロック用 | ||
| 100kΩ | 1 | リセット回路用 | ||
| LED | 8 | |||
| DIPスイッチ 4P | 1 | @100 | 入力用 | |
| DIPスイッチ 8P | 16 | @110 | ROM用 | |
| ICソケット 8P | 1 | 10@100 | ||
| ICソケット 14P | 4 | 10@120 | ||
| ICソケット 16P | 25 | 10@180 | ||
| ICソケット 20P | 1 | 10@170 | ||
| ダイオード | 128 | 200@200 | 1S1588相当品 | 200個セットで購入 |
| プッシュスイッチ | 1 | 3.5mmピッチ | リセットボタン用 | |
| プッシュスイッチ | 1 | 6mmピッチ角 | 手動クロック用 | |
| スペーサー | 8 | @50 | 四隅につけることができます | |
| 基板 | 1 | 5@3500 | JLCPCB発注、送料込み |
既知の不具合
- ROM横のLEDの表示が反転しています。ROMが選択されていないときは点灯し、選択されているときは消灯します。
- LEDにつながっているGNDを5Vに置き換えることで修正可能だと思われます。上の部品リストには含んでいません。
Parts
252| Qty | Value | Footprint | References |
|---|---|---|---|
| 128 | D | unyacat:Diode_THT_D_DO-35_SOD27_P5.08_Vertival_AnodeUp-no-circle | D10, D11, D100, D101, D102, D103, D104, D105, D106, D107, D108, D109, D110, D111, D112, D113 +112 |
| 36 | R | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R2, R10, R11, R12, R13, R14, R15, R16, R17, R23, R24, R25, R26, R27, R28, R29 +20 |
| 24 | LED | LED_THT:LED_D3.0mm | D1, D133, D134, D135, D136, D137, D138, D139, D140, D141, D142, D143, D144, D145, D146, D147 +8 |
| 16 | C | Capacitor_THT:C_Rect_L7.0mm_W2.5mm_P5.00mm | C1, C2, C3, C4, C5, C6, C7, C8, C10, C11, C12, C14, C15, C16, C17, C18 |
| 16 | SW_DIP_x08 | Package_DIP:DIP-16_W7.62mm_Socket | SW2, SW3, SW4, SW5, SW6, SW7, SW8, SW9, SW10, SW11, SW12, SW13, SW14, SW15, SW16, SW17 |
| 4 | 74HC161AP | Package_DIP:DIP-16_W7.62mm_Socket | U2, U3, U4, U5 |
| 4 | MountingHole | MountingHole:MountingHole_3.2mm_M3 | H1, H2, H3, H4 |
| 2 | 1K | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R18, R20 |
| 2 | 5.1K | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R21, R22 |
| 2 | 74HC138 | Package_DIP:DIP-16_W7.62mm_Socket | U14, U15 |
| 2 | CD74HC153 | Package_DIP:DIP-16_W7.62mm_Socket | U6, U7 |
| 1 | 100K | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R19 |
| 1 | 10u | Capacitor_THT:C_Rect_L7.0mm_W2.5mm_P5.00mm | C13 |
| 1 | 33K | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R1 |
| 1 | 74HC14 | Package_DIP:DIP-14_W7.62mm_Socket | U1 |
| 1 | CD74HC10 | Package_DIP:DIP-14_W7.62mm_Socket | U10 |
| 1 | CD74HC283 | Package_DIP:DIP-16_W7.62mm_Socket | U8 |
| 1 | CD74HC32 | Package_DIP:DIP-14_W7.62mm_Socket | U11 |
| 1 | CD74HC540 | Package_DIP:DIP-20_W7.62mm_Socket | U13 |
| 1 | CD74HC74 | Package_DIP:DIP-14_W7.62mm_Socket | U9 |
| 1 | Conn_01x01_Socket | Connector_PinHeader_1.27mm:PinHeader_1x01_P1.27mm_Vertical | J2 |
| 1 | LOGO | LOGO | G*** |
| 1 | SW_DIP_x04 | Package_DIP:DIP-8_W7.62mm | SW1 |
| 1 | SW_Push | Button_Switch_THT:SW_PUSH_6mm_H13mm | SW20 |
| 1 | SW_Push | Button_Switch_THT:SW_PUSH_1P1T_6x3.5mm_H5.0_APEM_MJTP1250 | SW18 |
| 1 | SW_SPDT | Button_Switch_THT:SW_Slide-03_Wuerth-WS-SLTV_10x2.5x6.4_P2.54mm | SW19 |
| 1 | USB_C_Receptacle_PowerOnly_6P | Connector_USB:USB_C_Receptacle_GCT_USB4125-xx-x_6P_TopMnt_Horizontal | J1 |
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Questions
How big is the Td4 PCB?
It measures 238.8 × 120.6 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Td4 use?
252 parts, built around the CD74HC540E, 74HC138, CD74HC153E and 74HC14. 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 Td4 KiCad files?
From the unyacat/td4 repository on GitHub, at the commit this page was made from: the board is td4.kicad_pcb and its schematic td4.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Td4 design in my own project?
Its repository states no licence, so its author keeps all rights: ask unyacat before reusing the design.