1 open source board using the 74HC21
Real designs built with the 74HC21, 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.
acwrightThe 74HC21 in open source designs
The gallery holds 1 open source boards using the 74HC21 from 1 GitHub repository; a typical one measures about 100 × 57.6 mm and carries around 15 components.
100% are two-layer designs, the rest use four layers or more, and 100% carry an open source license.
The most starred is 6502 RAM Card by acwright.
What boards using the 74HC21 are built for
74HC21: common questions
Where can I find a 74HC21 reference design?
Each of the 1 boards on this page is a real design using the 74HC21. 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 74HC21?
The median is 100 × 57.6 mm, and 100% are two-layer designs.
What is the most popular open source board using the 74HC21?
By GitHub stars, 6502 RAM Card by acwright, with 47 stars.
Can I simulate one of these boards using the 74HC21 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.