SN74LS221 brand manufacturers: Motorola Semiconductor Products, Twicea stock, SN74LS221 reference price.Motorola Semiconductor Products. SN74LS221 parameters, SN74LS221 Datasheet PDF and pin diagram description download.You can use the SN74LS221 Logic - Signal Switches, Multiplexers, Decoders, DSP Datesheet PDF, find SN74LS221 pin diagram and circuit diagram and usage method of function,SN74LS221 electronics tutorials.You can download from the Twicea.