I2C
About the I2C PCB
I2C is an open source PCB design by KALTCHUK, published on GitHub. It is a 2-layer board measuring 99.7 × 69.9 mm, with 31 components from 21 distinct parts.
Other key parts include the 74LS85, 74LS74, 74LS04, 74LS08 and 74LS245. By type, the board carries 11 capacitors, 8 ICs, 5 connectors, 4 resistors, 2 crystals and 1 battery holder.
It belongs with the retro computing designs in this gallery.
From the project
"Anyone who has brought up CP/M on a homebuilt computer has felt this moment of elation. A myriad of connections are properly closed; bits are flying at lightning speeds over busses and through circuits and program logic, to produce a single prompt". Gary Kildall
Main components on the I2C
I2C bill of materials (BOM)
31 components, 21 distinct parts — part numbers from the project's BOM.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | 74LS85 | DIP-16_W7.62mm_Socket_LongPads | U1 |
| 1 | 74LS74 | DIP-14_W7.62mm_Socket_LongPads | U2 |
| 1 | 74LS04 | DIP-14_W7.62mm_Socket_LongPads | U3 |
| 1 | 74LS08 | DIP-14_W7.62mm_Socket_LongPads | U4 |
| 1 | 74LS245 | DIP-20_W7.62mm_Socket_LongPads | U5 |
| 1 | AT89C4051-24P | DIP-20_W7.62mm_Socket_LongPads | U6 |
| 1 | DS1307+ | DIP-8_W7.62mm_Socket_LongPads | U7 |
| 1 | FM24C64B | DIP-8_W7.62mm_Socket_LongPads | U8 |
| 1 | 24MHz | Crystal_HC49-U_Vertical | Y1 |
| 1 | 32.768kHz | Crystal_Round_D1.5mm_Vertical | Y2 |
| 1 | card addr | PinHeader_2x04_P2.54mm_Vertical | J1 |
| 1 | Power Bus | PinHeader_2x05_P2.54mm_Vertical | J2 |
| 1 | Signal Bus | PinHeader_2x20_P2.54mm_Vertical | J3 |
| 1 | I2C int | PinHeader_1x04_P2.54mm_Vertical | J4 |
| 1 | I2C ext | PinHeader_2x02_P2.54mm_Vertical | J5 |
| 1 | 3V | Battery-Holder_CR2032 | BT1 |
| 8 | 10nF | C_Disc_D3.8mm_W2.6mm_P2.50mm | C1, C2, C3, C4, C5, C6, C7, C8 |
| 1 | 10uF | CP_Radial_D5.0mm_P2.50mm | C9 |
| 2 | 33pF | C_Disc_D3.8mm_W2.6mm_P2.50mm | C10, C11 |
| 2 | 6k8 | R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R1, R2 |
Show 1 more
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 2 | 4x10k | R_Array_SIP5 | RN1, RN2 |
I2C design files
The KiCad project lives in the KALTCHUK/Z80_Modular_Computer repository on GitHub; these links point at the commit this page was built from.
I2C: common questions
How big is the I2C PCB?
The I2C measures 99.7 × 69.9 mm, has 2 copper layers and is 1.6 mm thick.
How many components are on the I2C?
31 components, from 21 distinct parts, with part numbers taken from the project's own BOM. The full bill of materials is listed on this page.
Where can I download the I2C design files?
From the KALTCHUK/Z80_Modular_Computer repository on GitHub, which has the KiCad layout, the schematic and the BOM; the links under Design files point to each one.
Can I use the I2C design in my own project?
The repository has no license, so all rights stay with KALTCHUK. Use it as a reference, and ask the author before reusing the design.
More boards in Z80_Modular_Computer
AVR/ArduinoTTY
99.7 × 69.9 mm43 parts2LNo license94
EProg (discrete part)
100.3 × 69.9 mm31 parts2LNo license94
CPU
99.7 × 69.9 mm29 parts2LNo license94
MEM
99.7 × 69.9 mm28 parts2LNo license94
PSU2
99.7 × 69.9 mm20 parts2LNo license94
FLASHv2
99.7 × 69.9 mm16 parts2LNo license94
AVR/ArduinoEProg
100 × 71.1 mm12 parts2LNo license94
Backplane v2
77.5 × 99.1 mm10 parts2LNo license94
Protoboardv2
99.7 × 69.9 mm9 parts2LNo license94
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