Electronics > Projects, Designs, and Technical Stuff

32:1 low cost mux switch?

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tozitom:
hi forum,
I've designed a "keyboard sniffer/simulator" with 16 channels input/output - basic working is: a uC receives signals from 16 channels input (keyboard or other), and replicates them via 2x16 channels mux (4067d) - it also comunicates with other board in between via RX/TX bus...
example: if I have COL1 and ROW1 connected on input, I replicate it on output by controlling both mux"ABCD" inputs.

Anyway, I need to do the same but with 32 channels now... and using 32:1 mux seems not to be an option due to high cost of such components (ex = ADG732)! I planned to duplicate the 2x16 channels configuration and control the setup with the uC (ABCD + ENABLE) but wonder if there's out there some 4067D equivalent with 32 channels, or any other simple way to do the job...

Thanks for looking.

capt bullshot:
I'd use four 4051 type muxes tied together to a 32:1 mux, using the enable pins. Most probably this is smaller and cheaper than a dual 4067 type.

NiHaoMike:
Also take a look at cheap microcontrollers and FPGAs.

Scrts:

--- Quote from: NiHaoMike on July 20, 2020, 01:38:51 pm ---Also take a look at cheap microcontrollers and FPGAs.

--- End quote ---

This.
Long time ago I did a mux with Xilinx 9536 CPLD, when other options were not available.

Kleinstein:
i would consider 4051 (8:1) and using 4 pins from the µC. One does not even need to used the enable pins.

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