3 open source boards using the 74HCT257
Real designs built with the 74HCT257, from public GitHub projects: a quick way to see how others power, decouple and connect it. Each board comes with its KiCad files, full parts list and a render — and you can simulate its firmware on HardLabs.
Z80ctrlng
jblang
101.6 × 53.3 mm63 parts4LMIT73
Rc-256page
PickledDog
99.1 × 49.9 mm12 parts2LApache-2.02
Z80ram
99.8 × 49.9 mm19 parts2LMIT73
The 74HCT257 in open source designs
The gallery holds 3 open source boards using the 74HCT257 from 2 GitHub repositories; a typical one measures about 99.8 × 49.9 mm and carries around 19 components.
67% are two-layer designs, the rest use four layers or more, and 100% carry an open source license.
The most starred is Z80ctrlng by jblang.
Parts used alongside the 74HCT257
What boards using the 74HCT257 are built for
74HCT257: common questions
Where can I find a 74HCT257 reference design?
Each of the 3 boards on this page is a real design using the 74HCT257. Open one to see how it is wired up, with the full BOM, a render of the layout and links to its KiCad files.
How big is a typical board using the 74HCT257?
The median is 99.8 × 49.9 mm, and 67% are two-layer designs.
What is the most popular open source board using the 74HCT257?
By GitHub stars, Z80ctrlng by jblang, with 73 stars.
Can I simulate one of these boards using the 74HCT257 before building it?
Yes. HardLabs turns a board's netlist and BOM into a working simulation, so you can boot and test firmware against it with no hardware on your desk.