4 layers324.3 × 185.6 mm
4 layers36.7 × 41 mm
CGROM
jimbro1000/cGROMCPLD/ROM based replacement for TI GROM chips
- Size
- 36.7 × 41 mm
- Copper layers
- 4
- Thickness
- 1.6 mm
- Parts
- 19
- Nets
- 56
- Pads
- 153
- Tracks, vias
- 352, 44
- Pours
- 2
- Routed
- Yes
- KiCad
- KiCad 9.0 (file 20241229)
- Created
- 13 Jan 2026
- Updated
- 15 Jan 2026
Overview
CGROM is an open-source printed circuit board by jimbro1000, from the jimbro1000/cGROM repository on GitHub. It is a 4-layer board of 36.7 × 41 mm with 19 parts on 56 nets, routed with 352 tracks and 44 vias.
It is built around the 74AHCT541D. Its parts include 6 capacitors, 3 resistors, 3 ICs, 3 diodes and 3 connectors. It belongs with the FPGA and CPLD boards of this library.
Main components
1Parts
19| Qty | Value | Footprint | References |
|---|---|---|---|
| 6 | 100nF | Capacitor_SMD:C_0402_1005Metric_Pad0.74x0.62mm_HandSolder | C1, C2, C3, C4, C5, C6 |
| 3 | 200R | PCM_Resistor_SMD_AKL:R_0402_1005Metric | R1, R2, R3 |
| 3 | LED | LED_SMD:LED_0603_1608Metric | D1, D2, D3 |
| 2 | Conn_01x08 | Connector_PinHeader_2.54mm:PinHeader_1x08_P2.54mm_Vertical | J1, J2 |
| 1 | 29F010 | Library:PLCC-32_THT-Socket | U3 |
| 1 | 74AHCT541 | Library:DHVQFN-20-1EP_2.5x4.5mm_P0.5mm_EP1x3mm | U2 |
| 1 | ASCO | Oscillator:Oscillator_SMD_EuroQuartz_XO53-4Pin_5.0x3.2mm | Y1 |
| 1 | ATF1504AS-xAx44 | Package_QFP:TQFP-44_10x10mm_P0.8mm | U1 |
| 1 | JTAG | Connector_PinHeader_2.54mm:PinHeader_2x05_P2.54mm_Vertical | J3 |
Questions
How big is the CGROM PCB?
It measures 36.7 × 41 mm and has 4 copper layers, 1.6 mm thick.
What parts does the CGROM use?
19 parts, built around the 74AHCT541D. 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 CGROM KiCad files?
From the jimbro1000/cGROM repository on GitHub, at the commit this page was made from: the board is CGROM.kicad_pcb and its schematic CGROM.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the CGROM design in my own project?
Its repository states no licence, so its author keeps all rights: ask jimbro1000 before reusing the design.
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