SN74BCT640DW
SN74BCT640DWE4
SN74BCT640DWG4
SN74BCT640DWR
SN74BCT640DWRE4
SN74BCT640DWRG4
SN74BCT640N
SN74BCT640NE4
SN74BCT640NS
SN74BCT640NSE4