SN74LS640DB
SN74LS640DBE4
SN74LS640DBG4
SN74LS640DBR
SN74LS640DBRE4
SN74LS640DBRG4
SN74LS640DW
SN74LS640DWE4
SN74LS640DWG4
SN74LS640DWR
010-62104791