SN74LS594N from Texas Instruments is a IC SERIAL-IN SHIFT-REG 16-DIP
SN74LS594NSR from Texas Instruments is a IC SERIAL-IN SHIFT-REG 16SO
SN74LS594NSRE4 from Texas Instruments is a IC SERIAL-IN SHIFT-REG 16SO
SN74LS594NSRG4 from Texas Instruments is a IC SHIFT REGISTER SGL 8B 16SO
SN74LS594D from Texas Instruments is a SERIAL IN PARALLEL OUT
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