SN74LS20N
SN74LS20NE4
SN74LS20NS
SN74LS20NSE4
SN74LS20NSG4
SN74LS20NSR
SN74LS20NSRE4
SN74LS20NSRG4
SN74LS20NSRSOP5.2
SN74LS21D