I am looking for a way to redirect 6 pcb traces with a push of a single button.
There is micro controller with a SD card connected and I would like to access the SD from a computer without needing to take the SD card out.
The plan is to use a SD card reader and solder wires to the pads inside and connect that with a 6 way cable plug. I would then need to disconnect the PCB traces going from the micro controller to the SD card so that it wont power up the system with 3.3v from USB.
Is this possible?
Best Answer
An Octal buffer/line driver with 3-state outputs 74HC244 can do what you want.
Each output buffer quad is controlled by a single enable pin. Use as many as you need (taking care of the data direction for each line of the SD card)