I'm DFAE in Japan and received the question by our customer as follows.
Q. If the same logic both A and B (e.g. A=H, B=H or A=L, B=L) input to control pin, what will HMC194A be happened ?
Off course the customer designs the schematic preventing the same logic inputs. Perhaps I think it is a kind of FMEA(Failure Mode and Effects Analysis).
HMC194A switch is in undefined state when A=B=low and A=B=high not shown in the truth table. Both ports cannot be selected or open at the same time.
The s-parameter data measured at these undefined states is included in zipped s-parameter file attached on product web page.