SN74LS640NSE4
SN74LS640NSG4
SN74LS640NSR
SN74LS640NSRE4
SN74LS640NSRG4
sn74LS641-1
SN74LS641-1DW
SN74LS641-1DWE4
SN74LS641-1DWG4
SN74LS641-1DWR
010-62104931