4 layers170.2 × 170.2 mm
Motherboard
MicroLind-Developers/microlind-hw
Hardware repository for the microlind project
135 partsCERN-OHL-P-2.0
4 layers170.2 × 170.2 mm
Motherboard
MicroLind-Developers/microlind-hwHardware repository for the microlind project
- Size
- 170.2 × 170.2 mm
- Copper layers
- 4
- Thickness
- 1.6 mm
- Parts
- 149
- Nets
- 271
- Pads
- 1,068
- Tracks, vias
- 2,751, 617
- Pours
- 8
- Routed
- Yes
- KiCad
- KiCad 9.0 (file 20241229)
- Created
- 31 Jul 2024
- Updated
- 7 Oct 2026
Overview
Motherboard is an open-source printed circuit board by MicroLind-Developers, from the MicroLind-Developers/microlind-hw repository on GitHub, published under the CERN-OHL-P-2.0 licence. It is a 4-layer board of 170.2 × 170.2 mm with 149 parts on 271 nets, routed with 2,751 tracks and 617 vias.
It is built around the ATMEGA88A-AU, 74HC245D and MAX232N, with the MCP2221A-I/P, 74HCT574D and 74LS670 among its other parts. Its parts include 43 capacitors, 28 ICs, 26 connectors, 21 resistors and 3 crystals. It belongs with the computers and single-board computers boards and the AVR (ATmega, ATtiny) and FPGA and CPLD boards of this library.
Main components
12
ATMEGA88A-AU
TQFP-32(7x7)-40℃~+85℃ 1.8V~5.5V 10bit 1KB 20MHz 23 512Byte 8 Bit 8KB AVR Built-in FLASH TQFP-32(7x7) Microcontrollers (MCU/MPU/SOC) ROHSMicrochip TechnologyMicrocontrollers (MCU/MPU/SOC)
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
MAX232N
PDIP-160℃~+70℃ 120Kbps 2 2 4.5V~5.5V Transceiver PDIP-16 RS232 ICs ROHSTexas InstrumentsRS232 ICs
MCP2221A-I/P
PDIP-14-40℃~+85℃ 13mA 3V~5.5V 46uA USB 2.0 USB to UART、USB to I2C PDIP-14 USB Converters ROHSMicrochip TechnologyUSB Converters74HCT574D
SO-20-300mil-40℃~+125℃ 1 18ns@4.5V,50pF 3.5pF 3ns 4.5V~5.5V 5ns 69MHz 6mA 6mA 74HCT Series 8 8uA D-Type Rising Edge Tri-State SOIC-20-300mil Flip Flops ROHSNexperiaFlip Flops74LS670
-Specialty LogicTexas Instruments
74HCT00D
SO-14-40℃~+125℃ 100mV、400mV 12ns@4.5V,50pF 2 2V 3.7V、4.4V 4 4.5V~5.5V 40uA 4mA 4mA 74HCT Series 800mV NAND Gate Overvoltage-tolerant input TTL Compatible CMOS SO-14 Logic Gates ROHSNexperiaLogic Gates74HCT02D
SO-14-40℃~+125℃ 19ns@4.5V,50pF 2 2V 2uA 3.7V 4 4.5V~5.5V 400mV 4mA 4mA 74HCT Series 800mV NOR Gate Overvoltage-tolerant input SOIC-14 Logic Gates ROHSNexperiaGates
74HCT85D
SOIC-16Multi-device cascading SOIC-16 Digital Comparators ROHSNexperiaDigital Comparators
MAX708CSA
SOP-8Supervisor And Reset ICsMSKSEMI
XR88C92CJ-F
PLCC-44(16.59x16.59)0℃~+70℃ 2 2.97V~5.5V 230.4Kbps 8Byte、16Byte Internal Oscillator、With automatic flow control、Configurable GPIO UART PLCC-44(16.59x16.59) UART ROHSMaxLinearUART
BC337
TO-92-31 NPN 100 100MHz 100nA 45V 5V 625mW 700mV 800mA NPN TO-92-3 Bipolar (BJT) ROHSFoshan Blue Rocket ElecBipolar (BJT)
README
README.mdmicrolind-hw
Hardware repository for the microlind project
Parts
149| Qty | Value | Footprint | References |
|---|---|---|---|
| 25 | 100n | Capacitor_THT:C_Disc_D5.0mm_W2.5mm_P2.50mm | C3, C13, C14, C17, C18, C24, C25, C26, C27, C28, C29, C30, C31, C32, C33, C34 +9 |
| 15 | 10k | Resistor_THT:R_Axial_DIN0204_L3.6mm_D1.6mm_P7.62mm_Horizontal | R1, R2, R3, R4, R5, R6, R7, R13, R14, R15, R16, R17, R18, R19, R20 |
| 6 | MountingHole | MountingHole:MountingHole_3.2mm_M3_ISO7380 | H1, H2, H3, H4, H5, H6 |
| 5 | 10u | Capacitor_THT:CP_Radial_D4.0mm_P2.00mm | C37, C38, C39, C41, C50 |
| 5 | 1u | Capacitor_THT:CP_Radial_D4.0mm_P2.00mm | C19, C20, C21, C22, C23 |
| 4 | 10k | Resistor_THT:R_Array_SIP9 | RN3, RN4, RN5, RN6 |
| 4 | 74HC245 | Package_DIP:DIP-20_W7.62mm_Socket | U2, U4, U6, U28 |
| 2 | 12p | Capacitor_THT:C_Disc_D5.0mm_W2.5mm_P2.50mm | C42, C43 |
| 2 | 22pF | Capacitor_THT:C_Disc_D5.0mm_W2.5mm_P2.50mm | C1, C2 |
| 2 | 43pF | Capacitor_THT:C_Disc_D5.0mm_W2.5mm_P2.50mm | C15, C16 |
| 2 | 4k7 | Resistor_THT:R_Axial_DIN0204_L3.6mm_D1.6mm_P7.62mm_Horizontal | R11, R12 |
| 2 | 74HCT148 | Package_DIP:DIP-16_W7.62mm_Socket | U17, U18 |
| 2 | 74HCT574 | Package_DIP:DIP-20_W7.62mm_Socket | U19, U21 |
| 2 | 74LS670 | Package_DIP:DIP-16_W7.62mm_Socket | U24, U25 |
| 2 | AS6C4008 | Package_DIP:DIP-32_W15.24mm_Socket | U7, U8 |
| 2 | BUT41 | Diode_THT:D_A-405_P7.62mm_Horizontal | D1, D2 |
| 2 | GAL 22V10 | Package_DIP:DIP-24_W7.62mm_Socket | U23, U26 |
| 2 | R_Network08 | Resistor_THT:R_Array_SIP9 | RN1, RN2 |
| 1 | +12v | Connector_PinHeader_2.54mm:PinHeader_1x01_P2.54mm_Vertical | J16 |
| 1 | 100µF | Capacitor_THT:CP_Radial_D6.3mm_P2.50mm | C11 |
| 1 | 10µF | Capacitor_THT:CP_Radial_D4.0mm_P2.00mm | C12 |
| 1 | 12MHz | Crystal:Crystal_HC49-U_Vertical | Y1 |
| 1 | 1k0 | Resistor_THT:R_Axial_DIN0204_L3.6mm_D1.6mm_P7.62mm_Horizontal | R9 |
| 1 | 1k5 | Resistor_THT:R_Axial_DIN0204_L3.6mm_D1.6mm_P7.62mm_Horizontal | R8 |
| 1 | 1k8 | Resistor_THT:R_Axial_DIN0204_L3.6mm_D1.6mm_P7.62mm_Horizontal | R10 |
| 1 | 2032 | kicad-lib:HU2032-CoinCellHolder | BT1 |
| 1 | 28C64 | Package_DIP:DIP-28_W15.24mm_Socket | U5 |
| 1 | 3.3864 | Crystal:Crystal_HC49-U_Vertical | Y2 |
| 1 | 32.768kHz | Crystal:Crystal_DS10_D1.0mm_L4.3mm_Vertical | Y3 |
| 1 | 33k | Resistor_THT:R_Axial_DIN0204_L3.6mm_D1.6mm_P7.62mm_Horizontal | R21 |
| 1 | 4x 10k | Resistor_THT:R_Array_SIP5 | RN7 |
| 1 | 65c22 | Package_DIP:DIP-40_W15.24mm_Socket | U12 |
| 1 | 74HCT00 | Package_DIP:DIP-14_W7.62mm_Socket | U20 |
| 1 | 74HCT02 | Package_DIP:DIP-14_W7.62mm_Socket | U16 |
| 1 | 74HCT85 | Package_DIP:DIP-16_W7.62mm_Socket | U22 |
| 1 | 74LS138 | Package_DIP:DIP-16_W7.62mm_Socket | U10 |
| 1 | ATmega88 | Package_DIP:DIP-28_W7.62mm_Socket | U9 |
| 1 | AudioAddon | Connector_PinSocket_2.54mm:PinSocket_2x20_P2.54mm_Vertical | P2 |
| 1 | BC337 | Package_TO_SOT_THT:TO-92_Inline | Q1 |
| 1 | CTS | Connector_PinHeader_2.54mm:PinHeader_1x02_P2.54mm_Vertical | J10 |
| 1 | Clock Exp. | Connector_PinHeader_2.54mm:PinHeader_1x06_P2.54mm_Vertical | J8 |
| 1 | Compact Flash Addon | Connector_PinSocket_2.54mm:PinSocket_2x10_P2.54mm_Vertical | P4 |
| 1 | Console | Connector_USB:USB_B_Lumberg_2411_02_Horizontal | P5 |
| 1 | EX1 | Connector_PinHeader_2.54mm:PinHeader_1x02_P2.54mm_Vertical | J13 |
| 1 | EX2 | Connector_PinHeader_2.54mm:PinHeader_1x02_P2.54mm_Vertical | J14 |
| 1 | ExpansionPort | Connector_PinSocket_2.54mm:PinSocket_2x25_P2.54mm_Vertical | P3 |
| 1 | FUT | Connector_PinHeader_2.54mm:PinHeader_1x02_P2.54mm_Vertical | J15 |
| 1 | GAL16V8 | Package_DIP:DIP-20_W7.62mm_Socket | U27 |
| 1 | HALT | Connector_PinHeader_2.54mm:PinHeader_1x02_P2.54mm_Vertical | J1 |
| 1 | Joystic Ports | kicad-lib:DSUB-9-Double_NorComp | P8 |
| 1 | LOGO | fly_E_14mm | G*** |
| 1 | LOGO | kicad-lib:ML_logo | G*** |
| 1 | LOGO | kicad-lib:pcbway | G*** |
| 1 | LOGO | motherboard:sre | G1 |
| 1 | LPen | Connector_PinHeader_2.54mm:PinHeader_1x02_P2.54mm_Vertical | J9 |
| 1 | MAX232 | Package_DIP:DIP-16_W7.62mm_Socket | U14 |
| 1 | MAX708 | Package_DIP:DIP-8_W7.62mm_Socket | U11 |
| 1 | MC6809 | Package_DIP:DIP-40_W15.24mm_Socket | U3 |
| 1 | MCP2221A | Package_DIP:DIP-14_W7.62mm_Socket | U15 |
| 1 | MEM | Connector_PinHeader_2.54mm:PinHeader_1x02_P2.54mm_Vertical | J12 |
| 1 | PC Speaker | Connector_PinHeader_2.54mm:PinHeader_1x03_P2.54mm_Vertical | J6 |
| 1 | POT Con | Connector_PinHeader_2.54mm:PinHeader_1x05_P2.54mm_Vertical | J7 |
| 1 | PS2_DEBUG_TX | Connector_PinHeader_2.54mm:PinHeader_1x01_P2.54mm_Vertical | J17 |
| 1 | Power | Connector_BarrelJack:BarrelJack_CUI_PJ-063AH_Horizontal | P7 |
| 1 | Power Switch | kicad-lib:CMD-Switch | SW1 |
| 1 | PowerLed | Connector_PinHeader_2.54mm:PinHeader_1x04_P2.54mm_Vertical | J4 |
| 1 | RTS | Connector_PinHeader_2.54mm:PinHeader_1x02_P2.54mm_Vertical | J11 |
| 1 | Reset | Connector_PinHeader_2.54mm:PinHeader_1x02_P2.54mm_Vertical | J5 |
| 1 | Reset EN | Connector_PinHeader_2.54mm:PinHeader_1x02_P2.54mm_Vertical | J3 |
| 1 | Serial | kicad-lib:23018431 | P6 |
| 1 | VideoAddon | Connector_PinSocket_2.54mm:PinSocket_2x20_P2.54mm_Vertical | P1 |
| 1 | Write Enable | Connector_PinHeader_2.54mm:PinHeader_1x02_P2.54mm_Vertical | J2 |
| 1 | XR88C92 | Package_LCC:PLCC-44_THT-Socket | U13 |
| 1 | ~ | kicad-lib:2xPS2-Mini-Din | P9 |
| 1 | ~ | kicad-lib:mITX | U1 |
The 143 most common of 149 parts.
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Questions
How big is the Motherboard PCB?
It measures 170.2 × 170.2 mm and has 4 copper layers, 1.6 mm thick.
What parts does the Motherboard use?
149 parts, built around the ATMEGA88A-AU, 74HC245D, MAX232N and MCP2221A-I/P. 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 Motherboard KiCad files?
From the MicroLind-Developers/microlind-hw repository on GitHub, at the commit this page was made from: the board is motherboard/WIP/motherboard-ng/motherboard.kicad_pcb. PCBKit opens the board in the browser, with nothing to install.
Can I use the Motherboard design in my own project?
Its repository publishes it under the CERN-OHL-P-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).