Controlling 7 Segment Display With a Mux

Hi,

why a mux? What are the constraints? Since you're posting this in an Altera forum, I assume you have an FPGA or a CPLD, which typically has plenty of I/O pins.

Okay, a mux. If you're not having enough I/O, a mux can solve this. The interwebs are full of instructions; maybe not for your special case, but if you look into pages for Arduino etc., where a lack of sufficient I/O count is much more common, you'll find tons of articles, e.g.:

• http://www.instructables.com/id/multiplexing-with-arduino-and-the-74hc595/ (http://www.instructables.com/id/multiplexing-with-arduino-and-the-74hc595/)

• http://maxembedded.com/2013/01/seven-segment-multiplexing/ (http://maxembedded.com/2013/01/seven-segment-multiplexing/)

Just adapt one of those designs to your needs.

Things to consider:

• your FPGA/CPLD board must be designed for the required DC current

• do not violate the absolute maximum DC current per I/O pin

• keep in mind that the supply current for the corresponding VCCIO pin(s) is the sum of all currents, which can be quite a lot

Best regards,

GooGooCluster