Tri-state input to three logic states

Question

I'm looking for an IC or small circuit that implements the following truth table:

Input	Output 1	Output 2
H	H	L
L	L	H
Z	H	H

Is this possible?

The purpose is to keep an SPI SS signal pulled high for two devices when the input is high-Z, and to otherwise select one of two devices. It would be possible to simply use an inverter but then one of the SS signals would always be active.

Answer 1

If there's nothing else connected to the line, a circuit like this will do:

^{simulate this circuit – Schematic created using CircuitLab}

Run simulation to see how it behaves.

Note that comparators are required, because the logic levels are non-standard. A simpler transistor-based version could be used, but probably takes as many or more components, even if resistor packs are considered.

If IN is not allowed to float (something else is pulling on it), or must meet valid logic threshold voltage otherwise (because other CMOS/TTL inputs are connected), another solution is required, or no solution may be possible.

I am assuming the tristate pin is available in isolation by itself.