4 layers406.4 × 50.8 mm
4 layers406.4 × 254 mm
Procseq
mrieker/pdp8i- Size
- 406.4 × 254 mm
- Copper layers
- 4
- Thickness
- 1.6 mm
- Parts
- 121
- Nets
- 358
- Pads
- 1,106
- Tracks, vias
- 1,584, 199
- Pours
- 2
- Routed
- Yes
- KiCad
- KiCad 7 (file 20221018)
- Created
- 12 Oct 2026
- Updated
- 1 Nov 2026
Overview
Procseq is an open-source printed circuit board by mrieker, from the mrieker/pdp8i repository on GitHub. It is a 4-layer board of 406.4 × 254 mm with 121 parts on 358 nets, routed with 1,584 tracks and 199 vias.
It is built around the 74AHC74D, 74AC109PC and 74AHC00D, with the 74AHC04D, 74AC151PC and 74AHC02D among its other parts. Its parts include 55 capacitors, 5 connectors, 4 resistors and 1 diode.
Main components
12
74AHC74D
SOP-14-40℃~+125℃ 1 115MHz 2 2V~5.5V 2uA 3pF 500ps 5ns 74AHC Series 8mA 8mA 9.3ns@5V,50pF Asynchronous Complementary D-Type Rising Edge Set and Reset SOP-14 Flip Flops ROHSNexperiaFlip Flops
74AC109PC
PDIP-16-40℃~+85℃ 1 10ns@5V,50pF 175MHz 2 24mA 24mA 2V~6V 2uA 4.5pF 74AC Series Complementary JK-Type Set and Reset PDIP-16 Flip Flops ROHSonsemiFlip Flops74AHC00D
SOIC-14-40℃~+125℃ 1.5V~3.85V 2V~5.5V 2uA 4 500mV~1.65V 7.5ns@5V,50pF 74AHC Series 8mA 8mA NAND Gate SOIC-14 Logic Gates ROHSNexperiaLogic Gates74AHC04D
SOIC-14-40℃~+125℃ 1 1.5V~3.85V 1.9V、2.9V、4.4V 2V~5.5V 2uA 500mV~1.65V 6 7.5ns@5V,50pF 74AHC 8mA 8mA SOIC-14 Inverters ROHSNexperiaInverters74AC151PC
PDIP-16-40℃~+85℃ 24mA 24mA 2V~6V 4uA 74AC 8.5ns@5V,50pF Single Supply PDIP-16 Signal Switches, Multiplexers, Decoders ROHSonsemiSignal Switches, Multiplexers, Decoders74AHC02D
SOP-14-40℃~+125℃ 1.5V~3.85V 1.9V、2.9V、3.94V、4.4V 100mV、360mV、550mV 2 2V~5.5V 2uA 4 500mV~1.65V 7.5ns@5V,50pF 74AHC Series 8mA 8mA NOR Gate SO-14 Logic Gates ROHSNexperiaGates74HC30S
SOP-140℃~+60℃ 1 1.5V~4.2V 1.9V~5.9V 100mV 25ns@5.0V,15pF 2V~6V 5.2mA 5.2mA 5.5uA 500mV~1.8V 74HC Series 8 NAND Gate Push-pull SOP-14 Logic Gates ROHSGRLogic Gates
74AC11PC
DIP-14-40℃~+85℃ 100mV、440mV 2.1V~3.85V 2.46V、2.9V、3.76V、4.4V、4.76V、5.4V 24mA 24mA 2V~6V 2uA 3 3 74AC Series 8ns@5V,50pF 900mV~1.65V AND Gate DIP-14 Logic Gates ROHSonsemiLogic Gates74AC153PC
PDIP-16-40℃~+85℃ 24mA 24mA 2V~6V 4uA 6.5ns@5V,50pF 74AC Single Supply PDIP-16 Signal Switches, Multiplexers, Decoders ROHSonsemiSignal Switches, Multiplexers, Decoders74AHC08D
SOIC-14-40℃~+125℃ 1.5V~3.85V 1.9V、2.9V、4.4V 2 2V~5.5V 2uA 4 500mV~1.65V 550mV 7.9ns@5V,50pF 74AHC Series 8mA 8mA AND Gate SOIC-14 Logic Gates ROHSNexperiaLogic Gates
74AHC138D
SO-16-40℃~+125℃ 2V~5.5V 4uA 6.3ns@5V,50pF 74AHC 8mA 8mA Decoder Single Supply SO-16 Signal Switches, Multiplexers, Decoders ROHSNexperiaSignal Switches / Encoders & Decoders / Multiplexers74HC175D
SOIC-16-40℃~+125℃ 0ns 1 13ns 24ns@6V,50pF 2V~6V 3pF 4 4uA 5.2mA 5.2mA 63MHz 74HC Series Asynchronous Complementary type D-Type Reset Rising Edge SOIC-16 Flip Flops ROHSToshibaFlip Flops
Parts
121| Qty | Value | Footprint | References |
|---|---|---|---|
| 55 | C | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | C11, C12, C13, C14, C15, C16, C17, C21, C22, C23, C24, C25, C26, C27, C31, C32 +39 |
| 6 | 74AHC540 | Package_DIP:DIP-20_W7.62mm | E21, E41, E51, E71, E72, E81 |
| 6 | 74AHC74 | Package_DIP:DIP-14_W7.62mm | E25, E34, E54, E65, E75, E77 |
| 5 | 74AC109 | Package_DIP:DIP-16_W7.62mm | E53, E56, E63, E67, E76 |
| 5 | 74AHC00 | Package_DIP:DIP-14_W7.62mm | E22, E36, E43, E46, E84 |
| 5 | 74AHC04 | Package_DIP:DIP-14_W7.62mm | E12, E23, E27, E44, E64 |
| 4 | 74AC151 | Package_DIP:DIP-16_W7.62mm | E32, E33, E61, E82 |
| 4 | 74AHC02 | Package_DIP:DIP-14_W7.62mm | E14, E37, E62, E85 |
| 4 | 74HC30 | Package_DIP:DIP-14_W7.62mm | E13, E15, E17, E24 |
| 4 | Conn_01x36 | Connector_PinHeader_2.54mm:PinHeader_1x36_P2.54mm_Vertical | J1, J2, J3, J4 |
| 3 | 1K | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R1, R2, R3 |
| 2 | 74AC11 | Package_DIP:DIP-14_W7.62mm | E35, E57 |
| 2 | 74AC153 | Package_DIP:DIP-16_W7.62mm | E73, E83 |
| 2 | 74AHC08 | Package_DIP:DIP-14_W7.62mm | E55, E74 |
| 2 | 74AHC138 | Package_DIP:DIP-16_W7.62mm | E11, E26 |
| 2 | 74HC175 | Package_DIP:DIP-16_W7.62mm | E52, E86 |
| 1 | 47K | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R4 |
| 1 | 74AC10 | Package_DIP:DIP-14_W7.62mm | E66 |
| 1 | 74AC161 | Package_DIP:DIP-16_W7.62mm | E47 |
| 1 | 74AC20 | Package_DIP:DIP-14_W7.62mm | E16 |
| 1 | 74AHC157 | Package_DIP:DIP-16_W7.62mm | E42 |
| 1 | 74AHC32 | Package_DIP:DIP-14_W7.62mm | E45 |
| 1 | 74HC27 | Package_DIP:DIP-14_W7.62mm | E31 |
| 1 | Conn_01x02 | Connector_PinHeader_2.54mm:PinHeader_1x02_P2.54mm_Vertical | J5 |
| 1 | DSB2810 | Diode_THT:D_DO-35_SOD27_P7.62mm_Horizontal | D1 |
| 1 | LOGO | myfoots:bwlogo15 | G*** |
Questions
How big is the Procseq PCB?
It measures 406.4 × 254 mm and has 4 copper layers, 1.6 mm thick.
What parts does the Procseq use?
121 parts, built around the 74AHC74D, 74AC109PC, 74AHC00D and 74AHC04D. 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 Procseq KiCad files?
From the mrieker/pdp8i repository on GitHub, at the commit this page was made from: the board is kicads/procseq/procseq.kicad_pcb and its schematic kicads/backplane/backplane.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Procseq design in my own project?
Its repository states no licence, so its author keeps all rights: ask mrieker before reusing the design.
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