31 Mar '15, 2am

New Part Day: Modern PALs

Back in the bad old days, if you needed a little bit of custom logic you would whip out a tiny chip known as a PAL. A Programmable Logic Array is just what it sounds like and is the forerunner of modern, unsolderable CPLDs and FPGAs. PALs and GALs have died off, left to the wastes of the Jameco warehouse, and now it seems the only programmable logic you can buy are huge, 100-pin monstrosities. [Nick] at Arachnid Labs was working on his Tsunami signal generator when a user asked if they could add just one more feature: a programmable divider to count 256 iterations of a clock. This is the perfect application for dumb logic, but if you’re looking for a part that’s not recommended for new designs, you only need to look to old programmable logic. Enter the Greenpak . [Nick] had a dev kit for these ‘modern PALs’ sitting around and decided to give it a go. They’re small – they m...

Full article: http://hackaday.com/2015/03/30/new-part-day-modern-pals/

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