2 layers131.9 × 164.6 mm
4 layers324.3 × 185.6 mm
Griffin
bradgrantham/griffinAn M68000 homebrew SBC. See the design notes.
- Size
- 324.3 × 185.6 mm
- Copper layers
- 4
- Thickness
- 1.6 mm
- Parts
- 305
- Nets
- 645
- Pads
- 2,258
- Tracks, vias
- 5,432, 532
- Pours
- 2
- Routed
- Yes
- KiCad
- KiCad 9.0 (file 20241229)
- Created
- 4 Jan 2026
- Updated
- 7 Nov 2026
Overview
Griffin is an open-source printed circuit board by bradgrantham, from the bradgrantham/griffin repository on GitHub, published under the Apache-2.0 licence. It is a 4-layer board of 324.3 × 185.6 mm with 305 parts on 645 nets, routed with 5,432 tracks and 532 vias.
It is built around the 74AHCT541D, 74AC541SC and MAX232N, with the LM386, LM358 and 74HC4066D among its other parts. Its parts include 111 resistors, 74 capacitors, 41 ICs, 30 diodes and 16 connectors.
Main components
10
74AHCT541D
SO-20-300mil-40℃~+125℃ 4.5V~5.5V 5ns@5V,50pF 74AHCT 8 80uA 8mA 8mA Schmitt trigger Tri-State SO-20-300mil Buffers, Drivers, Receivers, Transceivers ROHSNexperiaBuffer/Driver/Transceiver74AC541SC
SOIC-20-300mil-40℃~+85℃ 24mA 24mA 2V~6V 40uA 74AC 8 9.5ns@5V,50pF Tri-State SOIC-20-300mil Buffers, Drivers, Receivers, Transceivers ROHSonsemiBuffer/Driver/Transceiver
MAX232N
PDIP-160℃~+70℃ 120Kbps 2 2 4.5V~5.5V Transceiver PDIP-16 RS232 ICs ROHSTexas InstrumentsRS232 ICs
LM386
SOP-80.2% 0℃~+70℃ 4V~12V 4mA 50dB 700mWx1@8Ω Analog voltage gain SOP-8 Audio Amplifiers ROHSGcoreAudio Power OpAmpsLM358
SOP-8-18V~18V 0℃~+70℃ 1.2MHz 10nA 2 24mA 3V~36V 500uA 50nA 5mV 80dB Built-in compensation SOP-8 Operational Amplifier ROHSMSKSEMIOperational Amplifier
74HC4066D
SO-14-40℃~+125℃ 15ns 1:1 25ns 2V~10V 38ns 4 54Ω 8pF SOIC-14 Analog Switches, Multiplexers ROHSNexperiaAnalog Switches, Multiplexers
MCP7940N-I/P
DIP-8-40℃~+85℃ 1.2uA 1.2uA 1.8V~5.5V External I2C Temperature compensation、Backup power management and battery charging、InsideSRAM/NVRAM、Timestamp function、Programmable clock output、Alarm function、Power-off retention of registers、ESD/Overvoltage protection、Periodic interrupt output Yes DIP-8 Real Time Clocks ROHSMicrochip TechnologyReal Time Clocks
4610X-R2R-103LF
SIP-10-2.54mm10 10kΩ 125mW 16 ±100ppm/℃ ±2% SIP-10-2.54mm Resistor Networks, Arrays ROHSBournsResistor Networks & Arrays
CR2032
-- Unclassified goods ROHSMaxellUncategorised
PN2222A
TO-92-3-55℃~+150℃ 1 NPN 1A 300MHz 300mV 40V 625mW NPN TO-92-3 Bipolar (BJT) ROHSNTE ElectronicsBipolar (BJT)
README
README.mdm68k-leftovers
An M68000 homebrew SBC. See the design notes.
Parts
305| Qty | Value | Footprint | References |
|---|---|---|---|
| 47 | 100nF | Capacitor_THT:C_Disc_D5.0mm_W2.5mm_P5.00mm | C1, C2, C10, C11, C12, C13, C14, C17, C18, C19, C20, C25, C26, C27, C28, C29 +31 |
| 28 | 1N4148 | Diode_THT:D_DO-35_SOD27_P7.62mm_Horizontal | D10, D11, D12, D13, D14, D15, D16, D17, D18, D19, D20, D21, D22, D23, D24, D25 +12 |
| 22 | 100R | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R32, R56, R120, R121, R122, R123, R124, R125, R126, R127, R128, R129, R130, R131, R132, R133 +6 |
| 22 | 1k | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R50, R51, R52, R53, R54, R57, R58, R59, R60, R61, R64, R65, R100, R101, R102, R103 +6 |
| 14 | 0R | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R28, R30, R35, R36, R37, R38, R39, R150, R151, R152, R153, R155, R156, R157 |
| 13 | 10K | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R3, R4, R5, R6, R8, R9, R10, R11, R12, R13, R14, R15, R33 |
| 13 | 10k | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R16, R83, R84, R91, R94, R104, R105, R106, R107, R108, R109, R112, R136 |
| 10 | 1uF | Capacitor_THT:CP_Radial_D5.0mm_P2.00mm | C70, C71, C72, C73, C74, C75, C76, C77, C78, C79 |
| 9 | IDT7200L15P | Package_DIP:DIP-28_W7.62mm | U20, U21, U23, U24, U25, U26, U29, U30, U31 |
| 5 | MountingHole | MountingHole:MountingHole_2.5mm_Pad_Via | H1, H2, H3, H4, H5 |
| 5 | TestPoint | TestPoint:TestPoint_Pad_D1.5mm | TP3, TP4, TP5, TP6, TP7 |
| 4 | 4.7k | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R87, R88, R110, R111 |
| 4 | 4610X-R2R-103LF | board:BO_4610X | R22, R80, R81, R82 |
| 4 | 74AHCT541 | Package_DIP:DIP-20_W7.62mm | U43, U44, U45, U46 |
| 3 | 100K | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R1, R20, R21 |
| 3 | 10R | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R93, R96, R154 |
| 3 | 250uF | Capacitor_THT:CP_Radial_D8.0mm_P3.50mm | C58, C60, C62 |
| 3 | 2N7000 | Package_TO_SOT_THT:TO-92_Inline | Q2, Q3, Q4 |
| 3 | 3.9k | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R55, R62, R69 |
| 3 | 47nF | Capacitor_THT:C_Rect_L7.2mm_W2.5mm_P5.00mm | C57, C59, C61 |
| 3 | 74F219 (part TBD) | Package_DIP:DIP-16_W7.62mm | U40, U41, U42 |
| 3 | LM386 | Package_DIP:DIP-8_W7.62mm | U33, U34, U35 |
| 2 | 0.5A polyfuse | Fuse:Fuse_Bourns_MF-RHT050 | F1, F2 |
| 2 | 100 | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R2, R17 |
| 2 | 100uF | Capacitor_THT:CP_Radial_D6.3mm_P2.50mm | C55, C56 |
| 2 | 10k bussed | Resistor_THT:R_Array_SIP7 | RN1, RN2 |
| 2 | 10nF film | Capacitor_THT:C_Rect_L7.2mm_W2.5mm_P5.00mm | C90, C91 |
| 2 | 1M | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R134, R135 |
| 2 | 2*(CL-Cs) TBD | Capacitor_THT:C_Disc_D5.0mm_W2.5mm_P5.00mm | C80, C81 |
| 2 | 2k | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R85, R86 |
| 2 | 33pF | Capacitor_THT:C_Disc_D3.0mm_W1.6mm_P2.50mm | C34, C35 |
| 2 | 47k | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R97, R98 |
| 2 | 74AC541 | Package_DIP:DIP-20_W7.62mm | U47, U48 |
| 2 | 8.2nF | Capacitor_THT:C_Rect_L7.2mm_W2.5mm_P5.00mm | C53, C54 |
| 2 | DEBUG_HEADER | board:IDC-Header_2x16_P2.54mm_Vertical | J8, J9 |
| 2 | MAX232 | Package_DIP:DIP-16_W7.62mm | U36, U37 |
| 1 | 10uF | Capacitor_THT:CP_Radial_D5.0mm_P2.00mm | C52 |
| 1 | 1K | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R34 |
| 1 | 1N5817 | Diode_THT:D_DO-41_SOD81_P10.16mm_Horizontal | D2 |
| 1 | 25.175MHz | Oscillator:Oscillator_DIP-8 | Y3 |
| 1 | 3.6864MHz | Crystal:Resonator-2Pin_W10.0mm_H5.0mm | Y5 |
| 1 | 32.768kHz CL 6-9pF | Crystal:Crystal_C26-LF_D2.1mm_L6.5mm_Vertical | Y6 |
| 1 | 4.7K | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R7 |
| 1 | 74HC4066 | Package_DIP:DIP-14_W7.62mm | U32 |
| 1 | AUDIO | Package_LCC:PLCC-84_THT-Socket | U28 |
| 1 | AUDIO_TICK | TestPoint:TestPoint_Pad_D1.5mm | TP8 |
| 1 | CF Card | board:SAMTEC_CFT-125-01-L-D-RA-01-SL | J7 |
| 1 | COMPOSITOR | Package_LCC:PLCC-84_THT-Socket | U22 |
| 1 | CONSOLE DB-25F DCE | Connector_Dsub:DSUB-25_Socket_Horizontal_P2.77x2.84mm_EdgePinOffset7.70mm_Housed_MountingHolesOffset9.12mm | J18 |
| 1 | CR2032 | Battery:BatteryHolder_Keystone_3034_1x20mm | BT1 |
| 1 | DE-15 VGA | board:AMPHENOL_ICD15S13E4GX00LF | J22 |
| 1 | ENGINE | Package_LCC:PLCC-84_THT-Socket | U18 |
| 1 | FTDI serial A | Connector_PinHeader_2.54mm:PinHeader_1x06_P2.54mm_Vertical | J3 |
| 1 | FTDI serial B | Connector_PinHeader_2.54mm:PinHeader_1x06_P2.54mm_Vertical | J12 |
| 1 | GLUE | Package_LCC:PLCC-84_THT-Socket | U13 |
| 1 | GREEN | LED_THT:LED_D3.0mm | D1 |
| 1 | JOYSTICK 1 | Connector_Dsub:DSUB-9_Pins_Horizontal_P2.77x2.84mm_EdgePinOffset4.94mm_Housed_MountingHolesOffset4.94mm | J20 |
| 1 | JOYSTICK 2 | Connector_Dsub:DSUB-9_Pins_Horizontal_P2.77x2.84mm_EdgePinOffset4.94mm_Housed_MountingHolesOffset4.94mm | J21 |
| 1 | JTAG | Connector_PinHeader_2.54mm:PinHeader_1x06_P2.54mm_Vertical | J2 |
| 1 | KEYBOARD | board:Mini_din6 | J4 |
| 1 | LM358 | Package_DIP:DIP-8_W7.62mm | U17 |
| 1 | MC68000 | Package_DIP:DIP-64_W22.86mm | U2 |
| 1 | MCP7940N-I/P | Package_DIP:DIP-8_W7.62mm | U39 |
| 1 | MODEM DB-25M DTE | Connector_Dsub:DSUB-25_Pins_Horizontal_P2.77x2.84mm_EdgePinOffset7.70mm_Housed_MountingHolesOffset9.12mm | J19 |
| 1 | MOUSE | board:Mini_din6 | J5 |
| 1 | OSC2 (optional, DNP) | Oscillator:Oscillator_DIP-8 | Y4 |
| 1 | PIXEL | Package_LCC:PLCC-84_THT-Socket | U19 |
| 1 | PIXEL_SPARE | Connector_PinHeader_2.54mm:PinHeader_2x10_P2.54mm_Vertical | J23 |
| 1 | PN2222A | Package_TO_SOT_THT:TO-92_Inline | Q1 |
| 1 | PORTS | Package_LCC:PLCC-84_THT-Socket | U14 |
| 1 | PORTS SPARE | Connector_PinHeader_2.54mm:PinHeader_1x03_P2.54mm_Vertical | J13 |
| 1 | RAM 1 HI | Package_DIP:DIP-32_W15.24mm | U6 |
| 1 | RAM 1 LO | Package_DIP:DIP-32_W15.24mm | U5 |
| 1 | RAM 2 HI | Package_DIP:DIP-32_W15.24mm | U8 |
| 1 | RAM 2 LO | Package_DIP:DIP-32_W15.24mm | U7 |
| 1 | RAM 3 HI | Package_DIP:DIP-32_W15.24mm | U10 |
| 1 | RAM 3 LO | Package_DIP:DIP-32_W15.24mm | U9 |
| 1 | RAM 4 HI | Package_DIP:DIP-32_W15.24mm | U12 |
| 1 | RAM 4 LO | Package_DIP:DIP-32_W15.24mm | U11 |
| 1 | RCA LINE OUT L | board:CUI_RCJ-044 | J14 |
The 296 most common of 305 parts.
Questions
How big is the Griffin PCB?
It measures 324.3 × 185.6 mm and has 4 copper layers, 1.6 mm thick.
What parts does the Griffin use?
305 parts, built around the 74AHCT541D, 74AC541SC, MAX232N and LM386. 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 Griffin KiCad files?
From the bradgrantham/griffin repository on GitHub, at the commit this page was made from: the board is board/board.kicad_pcb and its schematic board/audio-amp.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Griffin design in my own project?
Its repository publishes it under the Apache-2.0 licence: you may reuse it on that licence's terms (keep the author's notice, and for a copyleft licence share your changes alike).
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