MC145026
This encoder serially transmits trinary data as defined by the state of
A1 through A5 and A6/D6 through A9/D9 input pins. These pins may be in
either of these states (loiw, high, or open) allowing 19,683 possible codes.
For detail specification, please visit the following website.
http://www.alldatasheet.com/datasheet-pdf/pdf/158306/MOTOROLA/MC145026.html