3 open source boards using the 74LS90
Real designs built with the 74LS90, 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.
Ttl clock
skiselev
100 × 100 mm60 parts2LGPL-3.028- schematic only · 64 parts
Squarely
Broosky
64 partsNo license2 
Leaky bucket
tpcarlson
20 × 128.5 mm110 parts2LNo license106
The 74LS90 in open source designs
The gallery holds 3 open source boards using the 74LS90 from 3 GitHub repositories; a typical one measures about 60 × 114.3 mm and carries around 64 components.
100% are two-layer designs, the rest use four layers or more, and 33% carry an open source license.
The most starred is Leaky bucket by tpcarlson.
What boards using the 74LS90 are built for
74LS90: common questions
Where can I find a 74LS90 reference design?
Each of the 3 boards on this page is a real design using the 74LS90. 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 74LS90?
The median is 60 × 114.3 mm, and 100% are two-layer designs.
What is the most popular open source board using the 74LS90?
By GitHub stars, Leaky bucket by tpcarlson, with 106 stars.
Can I simulate one of these boards using the 74LS90 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.