Well to decode 3 bit binary input into 1 of 8 active low outputs one can use a 74hc138 ( http://www.nxp.com/documents/data_sheet/74HC_HCT138.pdf )
for a 4 bit to 16 bit decoder a 74hc154 would work ( http://www.nxp.com/documents/data_sheet/74HC_HCT154.pdf )
Lefty