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SN74HC257DR brand manufacturers: National Semiconductor, Anli stock, SN74HC257DR reference price.National Semiconductor. SN74HC257DR parameters, SN74HC257DR Datasheet PDF and pin diagram description download.You can use the SN74HC257DR Logic - Signal Switches, Multiplexers, Decoders, DSP Datesheet PDF, find SN74HC257DR pin diagram and circuit diagram and usage method of function,SN74HC257DR electronics tutorials.You can download from the Anli.