4 layers271.8 × 147.3 mm
2 layers135.9 × 41.3 mm
Uart
scefrom/SF682A board featuring the Motorola 68000
- Size
- 135.9 × 41.3 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 23
- Nets
- 76
- Pads
- 202
- Tracks, vias
- 246, 38
- Pours
- 2
- Routed
- Yes
- KiCad
- KiCad 9.0 (file 20241229)
- Created
- 15 Jul 2025
- Updated
- 20 Sep 2026
Overview
Uart is an open-source printed circuit board by scefrom, from the scefrom/SF68 repository on GitHub. It is a 2-layer board of 135.9 × 41.3 mm with 23 parts on 76 nets, routed with 246 tracks and 38 vias.
It is built around the 74HC541D, MAX232N and 74HC688D. Its parts include 5 capacitors, 4 ICs, 4 connectors, 1 resistor and 1 crystal. It belongs with the interfaces and adapters boards and the FPGA and CPLD boards of this library.
Main components
3
74HC541D
SO-20-300mil-40℃~+125℃ 1 12ns@4.5V,50pF 160uA 2V~6V 7.8mA 7.8mA 74HC 8 Output enable Tri-State Unidirectional SO-20-300mil Buffers, Drivers, Receivers, Transceivers ROHSNexperiaBuffers, Drivers, Receivers, Transceivers
MAX232N
PDIP-160℃~+70℃ 120Kbps 2 2 4.5V~5.5V Transceiver PDIP-16 RS232 ICs ROHSTexas InstrumentsRS232 ICs74HC688D
SOIC-20-300mil-40℃~+125℃ 0.1V 0.5V、1.35V、1.8V 1.2V、2.4V、3.2V 1.9V、4.4V、5.9V 160uA 16ns@6.0V,50pF 2V~5V SOIC-20-300mil Digital Comparators ROHSNexperiaDigital Comparators
Parts
23| Qty | Value | Footprint | References |
|---|---|---|---|
| 4 | 100n | Capacitor_THT:C_Disc_D3.0mm_W1.6mm_P2.54mm | B6, B6, B6, B6 |
| 4 | 1u | Capacitor_THT:CP_Radial_D5.0mm_P2.00mm | C1, C2, C3, C4 |
| 3 | 100n | Capacitor_THT:C_Disc_D3.0mm_W1.6mm_P7.62mm | B1, B1, B1 |
| 1 | 1.8432MHz | Oscillator:Oscillator_DIP-14 | Y1 |
| 1 | 22p | Capacitor_THT:C_Disc_D3.0mm_W1.6mm_P2.54mm | C5 |
| 1 | 4k7 | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R1 |
| 1 | 74HC541 | Package_DIP:DIP-20_W7.62mm | U3 |
| 1 | 74HC688 | Package_DIP:DIP-20_W7.62mm | U4 |
| 1 | ATF1504AS-xJx44 | Package_LCC:PLCC-44_THT-Socket | U1 |
| 1 | Conn_02x05_Top_Bottom | Connector_IDC:IDC-Header_2x05_P2.54mm_Horizontal | J4 |
| 1 | DE9_Pins_MountingHoles | Connector_Dsub:DSUB-9_Pins_Horizontal_P2.77x2.84mm_EdgePinOffset7.70mm_Housed_MountingHolesOffset9.12mm | J1 |
| 1 | MAX232 | Package_DIP:DIP-16_W7.62mm | U2 |
| 1 | MountingHole_3.2mm_M3_DIN965_Pad | MountingHole:MountingHole_3.2mm_M3_DIN965_Pad | M1 |
| 1 | perslota | Connector_PCBEdge:edge_connector_30p_2.54mm | J2 |
| 1 | perslotb | Connector_PCBEdge:edge_connector_15p_2.54mm | J3 |
Questions
How big is the Uart PCB?
It measures 135.9 × 41.3 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Uart use?
23 parts, built around the 74HC541D, MAX232N and 74HC688D. 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 Uart KiCad files?
From the scefrom/SF68 repository on GitHub, at the commit this page was made from: the board is uart/uart/uart.kicad_pcb and its schematic SF68.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Uart design in my own project?
Its repository states no licence, so its author keeps all rights: ask scefrom before reusing the design.
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