I'm currently working on a project that requires interfacing to a clock and data line at a configurable voltage between 0V-5V with nonstandard logic levels, this voltage is generated elsewhere. To be able to receive data the lines needs to be able to go into a high impedance state.
I'm currently playing around with a 4066, I have two lines of two pairs hooked together, one channel of the 4066 is hooked to the voltage and the other to ground and I simply drive them inverted. To get a high impedance state I drive both switches low. This being said it doesn't work real well since I'm having trouble hitting the ground rail.
All the buffers I found with tri-state outputs are for digital logic levels, could anyone recommend a analog one or another approach?
(For anyone interested I'm investigating the lowest voltages that I can use to interface to various IC's)
I eventually found this bug, I replaced the the 4066 with one from another manufacturer and it worked…
Best Answer
If I understand correctly, you are looking for an analog multiplexer with the option of setting the channels to high impedance.
If so, the 4052 or 4053 should do the job, they have an enable input which sets the ports to high impedance.
As mentioned in the comments, it might be a good idea to post a rough schematic of what you are doing, as it's a little unclear at present.