Elektrine lite

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@azonenberg@ioc.exchange

Post #4252529

2026-07-30 20:33 UTC

Crossing off anything Digikey has a high MOQ on, or that doesn't have at least 30 3.3V capable GPIOs, we're down to a handful of options. Some of the promising Efinix parts (Ti125) are too new and not available yet but look really nice for the future. I'm focusing on board footprints and compatibility here, there are lower speed grade/cost/density options available here, but to avoid decision paralysis I'm not cost optimizing yet. Just looking at "can I get this part without spending tens of k$ buying a full reel/tray" and not nitpicking over a $20 vs $50 SKU in the same package. I'm also de-prioritizing anything >$100 in low volume or available via digikey backorder but not kept in stock. Basically we're down to: * XC7S15-2CPGA196C: $29, 15K LE, 100 GPIO, 8mm *XCSU35P-2MCVA361E: $66, 35K LE, 220 GPIO, 10mm * T20F169C3: $11, 20K LE, 73 GPIO, 9mm * T120F324I4: $58, 120 LE, 130 GIO, 12mm There are no transceiver parts that meet my requirements from either vendor without going to a 16mm or larger package which kinda defeats the point.

Replies (1)

  • @azonenberg@ioc.exchange 2026-07-30 20:39

    Once it becomes available the TI125 (8mm, 36 HVIO, 110 HSIO, no transceivers) will be an extremely attractive option for this type of project. But for now it seems like the T20F169 is a clear winner - a third of the price of the competing Xilinx part and only 1mm larger on a side. The T20 has 1.04 Mb of block RAM, 36 multipliers, and 5 PLLs. The 7S15 has 360 Kb of BRAM, 20 DSPs, and 4 PLLs. So unless you need the speed of the 28nm Xilinx fabric over the 40nm Efinix fabric, the Trion is the way to go. For MCU peripheral expansion it seems a good option.

    Open ##4252651