2 layers99.8 × 99.8 mm
2 layers99.8 × 99.8 mm
MECB IO
epaell/MECB6- Size
- 99.8 × 99.8 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 37
- Nets
- 101
- Pads
- 252
- Tracks, vias
- 715, 32
- Pours
- 2
- Routed
- Yes
- KiCad
- KiCad 9.0 (file 20241229)
- Created
- 2 Jul 2024
- Updated
- 25 Oct 2026
Overview
MECB IO is an open-source printed circuit board by epaell, from the epaell/MECB repository on GitHub. It is a 2-layer board of 99.8 × 99.8 mm with 37 parts on 101 nets, routed with 715 tracks and 32 vias.
It is built around the ATF22V10C-15PU, 74LS245SC and 74LS174DC, with the 74LS374PC, DS1302+ and CR2032 among its other parts. Its parts include 8 resistors, 8 diodes, 5 capacitors, 5 ICs and 3 connectors. It belongs with the FPGA and CPLD boards of this library.
Main components
6
ATF22V10C-15PU
PDIP-245V EEPLD PDIP-24 Programmable Logic Device (CPLDs/FPGAs) ROHSMicrochip TechnologyProgrammable Logic Device (CPLDs/FPGAs)74LS245SC
-0℃~+70℃ 12ns@5V,45pF 15mA 24mA 4.75V~5.25V 74LS 8 Bidirectional Output enable Schmitt trigger Tri-State - Buffers, Drivers, Receivers, Transceivers ROHSTexas InstrumentsBuffers, Drivers, Receivers, Transceivers
74LS174DC
-0ns 0℃~+70℃ 1 16mA 20ns 30MHz 30ns@5V,15pF 4.75V~5.25V 400uA 6 74LS Series 8mA Asynchronous Push-Pull Reset Rising Edge - Flip Flops ROHSonsemiFlip Flops
74LS374PC
PDIP-200ns 0℃~+70℃ 1 20ns 28ns@5V,45pF 35MHz 4.75V~5.25V 45mA 74LS Series 8 D-Type Rising Edge Tri-State PDIP-20 Flip FlopsonsemiFlip Flops
DS1302+
DIP-80℃~+70℃ 1nA 2V~5.5V 300nA Backup power management and battery charging、InsideSRAM/NVRAM External No SPI DIP-8 Real Time Clocks ROHSMaxim Integrated (Analog Devices)Real Time Clocks
CR2032
-- Unclassified goods ROHSMaxellUncategorised
README
SDCardShield/README.mdSDCardShield
A version of the SD Card shield that was originally developed by Corsham Technologies for the SWTPC. It has been modified to work with the MECB I/O board (PIA port) and makes use of Adafruit modules to implement the realtime clock:
https://core-electronics.com.au/adafruit-ds3231-precision-rtc-breakout.html
and microSD interface:
https://core-electronics.com.au/microsd-card-breakout-board.html
Parts
37| Qty | Value | Footprint | References |
|---|---|---|---|
| 8 | 330 | Resistor_THT:R_Axial_DIN0309_L9.0mm_D3.2mm_P12.70mm_Horizontal | R1, R2, R3, R4, R5, R6, R7, R8 |
| 8 | LED | LED_THT:LED_D3.0mm_Horizontal_O1.27mm_Z2.0mm | D1, D2, D3, D4, D5, D6, D7, D8 |
| 5 | 0.1uF | Capacitor_THT:C_Disc_D5.0mm_W2.5mm_P5.00mm | C1, C2, C3, C4, C5 |
| 4 | MountingHole | MountingHole:MountingHole_3.2mm_M3 | H1, H2, H3, H4 |
| 1 | 2K2 | Resistor_THT:R_Array_SIP9 | RN1 |
| 1 | 32.768kHz | Crystal:Crystal_AT310_D3.0mm_L10.0mm_Horizontal | Y1 |
| 1 | 74LS174 | Package_DIP:DIP-16_W7.62mm_Socket_LongPads | U2 |
| 1 | 74LS245 | Package_DIP:DIP-20_W7.62mm_Socket_LongPads | U4 |
| 1 | 74LS374 | Package_DIP:DIP-20_W7.62mm_Socket_LongPads | U5 |
| 1 | ATF22V10C-15PU | MyCustomFootprintLibrary:DIP-24_W7.62mm_Socket_LongPads_ZIF_Friendly | U1 |
| 1 | CR2032 | Battery:BatteryHolder_MYOUNG_BS-07-A1BJ001_CR2032 | BT1 |
| 1 | Conn_01x03 | Connector_PinHeader_2.54mm:PinHeader_1x03_P2.54mm_Vertical | J3 |
| 1 | Conn_02x10_Odd_Even | Connector_IDC:IDC-Header_2x10_P2.54mm_Vertical | J2 |
| 1 | DS1302+ | Package_DIP:DIP-8_W7.62mm_Socket_LongPads | U3 |
| 1 | MECB_64AC | MyCustomFootprintLibrary:DIN41612_C_2x32_C64AC_Male_Horizontal_THT | J1 |
| 1 | SW_DIP_x08 | Package_DIP:DIP-16_W7.62mm_Socket_LongPads | SW1 |
Questions
How big is the MECB IO PCB?
It measures 99.8 × 99.8 mm and has 2 copper layers, 1.6 mm thick.
What parts does the MECB IO use?
37 parts, built around the ATF22V10C-15PU, 74LS245SC, 74LS174DC and 74LS374PC. 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 MECB IO KiCad files?
From the epaell/MECB repository on GitHub, at the commit this page was made from: the board is MECB_IO/MECB_IO.kicad_pcb and its schematic 68008Tester/68008test.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the MECB IO design in my own project?
Its repository states no licence, so its author keeps all rights: ask epaell before reusing the design.
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