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SN74LS640DWR brand manufacturers: National Semiconductor, Anli stock, SN74LS640DWR reference price.National Semiconductor. SN74LS640DWR parameters, SN74LS640DWR Datasheet PDF and pin diagram description download.You can use the SN74LS640DWR Logic - Buffers, Drivers, Receivers, Transceivers, DSP Datesheet PDF, find SN74LS640DWR pin diagram and circuit diagram and usage method of function,SN74LS640DWR electronics tutorials.You can download from the Anli.