4 layers67.3 × 48.5 mm
4 layers78.2 × 50 mm
RAMWorks-compatible auxiliary RAM expansion card for Apple IIe
- Size
- 78.2 × 50 mm
- Copper layers
- 4
- Thickness
- 1.61 mm
- Parts
- 81
- Nets
- 163
- Pads
- 493
- Tracks, vias
- 1,905, 527
- Pours
- 1,225
- Routed
- Yes
- KiCad
- KiCad 8.0 (file 20240108)
- Created
- 25 Jul 2020
- Updated
- 10 Apr 2025
Overview
RAM2E is an open-source printed circuit board by garrettsworkshop, from the garrettsworkshop/RAM2E repository on GitHub. It is a 4-layer board of 78.2 × 50 mm with 81 parts on 163 nets, routed with 1,905 tracks and 527 vias.
It is built around the LCMXO2-640HC-4TG100C, 74LVC245APW and 74AHCT245PW, with the 74AHCT1G125GW, CH340G and AP2127K-1.2TRG1 among its other parts. Its parts include 36 capacitors, 16 resistors, 11 ICs, 5 connectors and 1 diode. It belongs with the FPGA and CPLD boards of this library.
Main components
8
LCMXO2-640HC-4TG100C
TQFP-100(14x14)0℃~+85℃ 18432bit 2.375V~3.465V 640 78 80 MachXO2 Supports hot swap TQFP-100(14x14) Programmable Logic Device (CPLDs/FPGAs) ROHSLatticeProgrammable Logic Device (CPLDs/FPGAs)
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, Transceivers74AHCT245PW
TSSOP-20-40℃~+125℃ 1 3.5ns@5V,15pF 4.5V~5.5V 74AHCT 8 80uA 8mA 8mA Bidirectional Schmitt trigger Tri-State TSSOP-20 Buffers, Drivers, Receivers, Transceivers ROHSNexperiaBuffers, Drivers, Receivers, Transceivers
74AHCT1G125GW
SOT-353-40℃~+125℃ 1 1 4.5V~5.5V 4.8ns@5.5V,50pF 40uA 74AHCT 8mA 8mA Output enable、Level shifting Tri-State Unidirectional SOT-353 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
AP2127K-1.2TRG1
SOT-23-5-40℃~+85℃@(Ta) 1 1.2V 300mA 60uA 60uVrms 68dB@(1kHz) 900mV@(300mA) 9V Fixed Over Current Protection、Over Temperature Protection、Enable Positive SOT-23-5 Voltage Regulators - Linear, Low Drop Out (LDO) Regulators ROHSDiodes IncorporatedVoltage Regulators - Linear, Low Drop Out (LDO) Regulators
W9812G6KH-6
TSOPII-54-10.2mm0℃~+70℃ 128Mbit 166MHz 3V~3.6V TSOPII-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
81| Qty | Value | Footprint | References |
|---|---|---|---|
| 26 | 2u2 | stdpads:C_0603 | C10, C11, C12, C13, C14, C15, C16, C17, C18, C19, C20, C21, C22, C23, C24, C25 +10 |
| 7 | 10u | stdpads:C_0805 | C1, C2, C3, C4, C5, C6, C29 |
| 5 | 47 | stdpads:R_0603 | R2, R3, R12, R13, R22 |
| 5 | DNP | stdpads:R_0603 | R4, R5, R7, R8, R9 |
| 4 | Fiducial | stdpads:Fiducial | FID1, FID2, FID3, FID4 |
| 4 | ~ | stdpads:PasteHole_1.152mm_NPTH | H1, H2, H3, H4 |
| 3 | 22p | stdpads:C_0603 | C31, C32, C33 |
| 3 | 2k2 | stdpads:R_0603 | R6, R14, R15 |
| 3 | 74LVC245APW | stdpads:TSSOP-20_4.4x6.5mm_P0.65mm | U3, U4, U5 |
| 2 | 74AHCT245PW | stdpads:TSSOP-20_4.4x6.5mm_P0.65mm | U6, U7 |
| 2 | LOGO | LOGO | G***, G*** |
| 1 | 0 | stdpads:R_0805 | R1 |
| 1 | 10k | stdpads:R_0603 | R11 |
| 1 | 12M | stdpads:Crystal_SMD_3225-4Pin_3.2x2.5mm | Y1 |
| 1 | 220 | stdpads:R_0805 | R10 |
| 1 | 74AHCT1G125GW | stdpads:SOT-353 | U11 |
| 1 | AP2127K-1.2TRG1 | stdpads:SOT-23-5 | U9 |
| 1 | Amber | stdpads:LED_0805 | D1 |
| 1 | AppleIIeAux | stdpads:AppleIIeAux_Edge | J1 |
| 1 | C14M | stdpads:PinHeader_1x02_P2.54mm_Vertical | J4 |
| 1 | C14M | stdpads:EdgeClipHole | J3 |
| 1 | CH340G | stdpads:SOIC-16_3.9mm | U10 |
| 1 | JTAG | stdpads:Tag-Connect_TC2050-IDC-FP_2x05_P1.27mm_Vertical | J5 |
| 1 | LCMXO2-640HC-4TG100C | stdpads:TQFP-100_14x14mm_P0.5mm | U1 |
| 1 | W9812G6KH-6 | stdpads:TSOP-II-54_22.2x10.16mm_P0.8mm | U2 |
| 1 | XC6206P332MR | stdpads:SOT-23 | U8 |
| 1 | microUSB | stdpads:USB_Micro-B_Amphenol_10118192-0001 | J2 |
| 1 | ~ | stdpads:PasteHole_1.1mm_PTH | H5 |
Questions
How big is the RAM2E PCB?
It measures 78.2 × 50 mm and has 4 copper layers, 1.61 mm thick.
What parts does the RAM2E use?
81 parts, built around the LCMXO2-640HC-4TG100C, 74LVC245APW, 74AHCT245PW and 74AHCT1G125GW. 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 RAM2E KiCad files?
From the garrettsworkshop/RAM2E repository on GitHub, at the commit this page was made from: the board is Hardware/LCMXO2/RAM2E.kicad_pcb and its schematic Hardware/LCMXO2/Docs.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the RAM2E design in my own project?
Its repository states no licence, so its author keeps all rights: ask garrettsworkshop before reusing the design.
Similar boards
- 4 layers78.2 × 50 mm
- 4 layers57.9 × 59.4 mm
GW4302
garrettsworkshop/GW4302
Prototype RAM cartridge compatible with Commodore 1700/1750/1764 RAM Expansion Unit (REU)
100 parts11 - 4 layers40 × 40 mm
Snowboard fc
RotemCarr/snowboard-fc
Snowboard flight controller hardware and software stacks - using the Zephyr framework
103 parts - 4 layers97.8 × 25 mm
MacIIROMSIMM
garrettsworkshop/MacIIROMSIMM
ROM SIMM for Apple Macintosh II-series and Macintosh SE/30 machines
42 parts21 - 6 layers40 × 60 mm
Asic
roshan0282/ttsky-asic-rayforge
Tiny Tapeout is an educational project that aims to make it easier and cheaper than ever to get your digital and analog designs manufactured on a real chip.
86 partsApache-2.0 - 4 layers52.8 × 22.9 mm
- 4 layers53.3 × 85.1 mm
