SN74LS640DWR SN74LS640DW SN74LS640DBR SN74LS640AN SN74LS640-1NSR SN74LS640-1NS SN74LS640-1NE4 SN74LS640-1N SN74LS640-1DWR SN74LS640-1DWE4 SN74LS640DWRG4
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