6 layers108.1 × 136.5 mm
4 layers57.9 × 59.4 mm
Prototype RAM cartridge compatible with Commodore 1700/1750/1764 RAM Expansion Unit (REU)
- Size
- 57.9 × 59.4 mm
- Copper layers
- 4
- Thickness
- 1.61 mm
- Parts
- 100
- Nets
- 149
- Pads
- 588
- Tracks, vias
- 2,680, 643
- Pours
- 445
- Routed
- Yes
- KiCad
- KiCad 8.0 (file 20240108)
- Created
- 2 Jan 2022
- Updated
- 30 Mar 2025
Overview
GW4302 is an open-source printed circuit board by garrettsworkshop, from the garrettsworkshop/GW4302 repository on GitHub. It is a 4-layer board of 57.9 × 59.4 mm with 100 parts on 149 nets, routed with 2,680 tracks and 643 vias.
It is built around the 74LVC245APW, 74AHCT125PW and 74LVC1G17GW, with the CH340G, W25Q128JVSIQ and 74AHCT573PW among its other parts. Its parts include 40 capacitors, 28 resistors, 16 ICs, 4 connectors and 1 diode. It belongs with the retro computing and games boards and the FPGA and CPLD boards of this library.
Main components
9
74LVC245APW
TSSOP-20-40℃~+125℃ 8 Level translator Power-off protection、Output enable high-impedance TTL、CMOS Tri-State TSSOP-20 Buffers, Drivers, Receivers, Transceivers ROHSMDDBuffers, Drivers, Receivers, Transceivers
74AHCT125PW
TSSOP-14-40℃~+125℃ 1 4 4.3ns@4.5V,50pF 4.5V~5.5V 40uA 74AHCT 8mA 8mA Schmitt trigger Tri-State Unidirectional TSSOP-14 Buffers, Drivers, Receivers, Transceivers ROHSNexperiaBuffers, Drivers, Receivers, Transceivers
74LVC1G17GW
TSSOP-5-40℃~+125℃ 1 1 1.65V~5.5V 32mA 32mA 3ns@3.3V,50pF 4uA 74LVC Push-pull Schmitt trigger Unidirectional TSSOP-5-1.3mm Buffers, Drivers, Receivers, Transceivers ROHSNexperiaBuffers, Drivers, Receivers, Transceivers
CH340G
SOP-16-40℃~+85℃ 2Mbps 3.3V、5V USB 2.0 USB to UART SOP-16 USB Converters ROHSWCH (Nanjing Qinheng Microelectronics)USB Converters
W25Q128JVSIQ
SOIC-8-208mil-40℃~+85℃ 100,000 cycles 120ms@(32KB) 128Mbit 133MHz 1uA 2.7V~3.6V 20 Years 3ms Power-on reset、Hardware write protection、Software write protection、Write enable latch、Absolute write protection SPI SOIC-8-208mil NOR FLASH ROHSWinbondNOR FLASH74AHCT573PW
TSSOP-20-40℃~+125℃ 1.5ns 3.5ns 3.5ns 4.5V~5.5V 4uA 74AHCT 8 8mA 8mA D Latch Tri-State TSSOP-20 Latches ROHSNexperiaLatches
LM66200DRL
SOT-583-40℃~+125℃ 1.32uA 1.6V~5.5V 2 74mΩ Reverse current blocking、Over temperature protection、With enable SOT-583 ORing Controllers ROHSTexas InstrumentsPower Distribution Switches
W9825G6KH-6
TSOP-54-10.2mm0℃~+70℃ 166MHz 256Mbit 3V~3.6V TSOP-54-10.2mm SDRAM ROHSWinbond ElecSDRAM
XC6206P332MR
SOT-23-40℃~+85℃@(Ta) 1 1uA 200mA 3.3V 6V Fixed Over Current Protection Positive SOT-23-3L Voltage Regulators - Linear, Low Drop Out (LDO) Regulators ROHSTorex SemiconductorVoltage Regulators - Linear, Low Drop Out (LDO) Regulators
Parts
100| Qty | Value | Footprint | References |
|---|---|---|---|
| 33 | 2u2 | stdpads:C_0603 | C1, C2, C13, C14, C15, C16, C17, C18, C19, C20, C21, C22, C23, C24, C25, C26 +17 |
| 8 | 47 | stdpads:R_0603 | R1, R2, R6, R7, R10, R21, R24, R26 |
| 7 | 10k | stdpads:R_0603 | R3, R4, R9, R11, R12, R13, R14 |
| 7 | 3k3 | stdpads:R_0603 | R15, R16, R17, R18, R19, R20, R27 |
| 4 | 10u | stdpads:C_0805 | C9, C10, C11, C12 |
| 4 | 74LVC245APW | stdpads:TSSOP-20_4.4x6.5mm_P0.65mm | U6, U10, U11, U12 |
| 4 | Fiducial | stdpads:Fiducial | FID1, FID2, FID3, FID4 |
| 3 | 22p | stdpads:C_0603 | C37, C38, C39 |
| 3 | 74AHCT573PW | stdpads:TSSOP-20_4.4x6.5mm_P0.65mm | U7, U8, U9 |
| 3 | DNP | stdpads:R_0603 | R8, R23, R25 |
| 3 | ~ | stdpads:PasteHole_1.152mm_NPTH | H3, H4, H5 |
| 2 | 1k | stdpads:R_0603 | R5, R28 |
| 2 | 74AHCT125PW | stdpads:TSSOP-14_4.4x5mm_P0.65mm | U4, U5 |
| 2 | ~ | stdpads:PasteHole_1.1mm_PTH | H1, H2 |
| 1 | 12M | stdpads:Crystal_SMD_3225-4Pin_3.2x2.5mm | Y1 |
| 1 | 220 | stdpads:R_0805 | R22 |
| 1 | 74LVC1G17GW | stdpads:SOT-353 | U14 |
| 1 | BTN | stdpads:PinHeader_1x03_P2.00mm_Vertical | J4 |
| 1 | C64 | stdpads:AppleIIgsMemoryExpansion_Edge | J1 |
| 1 | CH340G | stdpads:SOIC-16_3.9mm | U13 |
| 1 | JTAG | stdpads:Tag-Connect_TC2050-IDC-FP_2x05_P1.27mm_Vertical | J3 |
| 1 | LCMXO2-640-TG100 | stdpads:TQFP-100_14x14mm_P0.5mm | U1 |
| 1 | LED | stdpads:LED_0805 | D1 |
| 1 | LM66200DRL | stdpads:SOT-583 | U16 |
| 1 | LOGO | LOGO | G*** |
| 1 | W25Q128JVSIQ | stdpads:SOIC-8_5.3mm | U3 |
| 1 | W9825G6KH-6 | stdpads:TSOP-II-54_22.2x10.16mm_P0.8mm | U2 |
| 1 | XC6206P332MR | stdpads:SOT-23 | U15 |
| 1 | microUSB | stdpads:USB_Micro-B_Amphenol_10118192-0001 | J2 |
Questions
How big is the GW4302 PCB?
It measures 57.9 × 59.4 mm and has 4 copper layers, 1.61 mm thick.
What parts does the GW4302 use?
100 parts, built around the 74LVC245APW, 74AHCT125PW, 74LVC1G17GW and CH340G. 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 GW4302 KiCad files?
From the garrettsworkshop/GW4302 repository on GitHub, at the commit this page was made from: the board is GW4302.kicad_pcb and its schematic GW4302.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the GW4302 design in my own project?
Its repository states no licence, so its author keeps all rights: ask garrettsworkshop before reusing the design.
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