"cmagagna GuestRe: 74138 family choice?#5Nov 07, 2012, 09:18 pmThanks everybody for your comments. @MarkT that was a great table of info; @CrossRoads thanks for the TPIC6B595 idea, I just ordered some to evaluate.I apologize for not being clear enough. The project is really a 24x16 LED matrix. 3 TLC5916s control the column cathodes and a 4:16 decoder made from 2 74AC138s connected to 16 P-channel logic level MOSFETs control the row anodes. I drive the LEDs @ 100 mA each to compensate for them only being on 1/16th of the time (the spec sheet says it's OK to drive them up to 120 mA if the pulse is < 0.1ms; I'm updating @ 50 KHz so no problem there).When I run the entire circuit at 5V everything works but the LEDs aren't spectacularly bright. When I run the LEDs at 12V they're bright enough, but I get ghosting on the rows...."