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74LS221DR274LS221NSR74LS20RPEL74LS240DBR
74LS20SCX74LS221DR74LS219AN74LS221FP
SN74LS219ANSN74LS21NSRSN74LS221DRSN74LS221NS
SN74LS21NSSN74LS21DRSN74LS221DSN74LS221J
SN74LS19ADBRSN74LS19ANSRSN74LS20DR2GSN74LS221DBR
SN74LS221DR2SN74LS221NSRSN74LS2323DRSN74LS240DBR
SN74LS244ADWRG4全新ROHSLS
原装SN74LS191SOP16393
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