I have a couple of questions about serial/parallel mux/demux chips for microcontroller interface. I have two related tasks.

1 - 24 channel led display. I am building a led based display with 24 leds, in 8 sets of three - imagine 8 traffic lights, on each light, only one of three on at any time. This presents (at least) two demux/buffering possibilities.
A - simply sequence through 24 outputs with latches (one clock line and one data line. or
B - eight outputs driving a second layer of three outputs each. A sounds easier, can anyone suggest a (dasiy-chainable) DIP chip option?

2 - 12 channel IR sensor input. I've got 12 sensors that need to be polled by an analog input (or two). Again - any suggestions for appropriate chip(s)

thanks!

 

1 - You might use an HEF-4794 or an HEF-4894 shift-and-store LED driver.

2 - If the speed is not too high you could use two 4051s or one 4067.

 

That, sir, is exactly the information I needed. Thankyou very much for your very prompt response.