SN74LS640DW
SN74LS640DWE4
SN74LS640DWG4
SN74LS640DWR
SN74LS640DWRE4
SN74LS640DWRG4
SN74LS640N
SN74LS640NE4
SN74LS640NS
SN74LS640NSE4
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