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贴片直插SN74LS221ML1G，SN74LS194ADR2，SN74LS221DR2G，4
SN74LVC1G97DBVT/SN74LVC244APWG4/SN74LS221DR
SN74LS04DR/SN74LV221APWT/SN74LVC244ANSR
SN74LS04DR/SN74LVC244ANSR/SN74LV221APWT
贴片直插SN74LS221N，SN74LS157N，SN74HC74DR，SN74LS132N，4
SN74LS221DBR SN74LS221DR SN74LS221N
全新SN74LS221DR正品IC MULTIVIBRATOR 45NS 16SOIC
全新SN74LS221DBR SN74LS20DR2G SN74LS19ANSR SN74LS19ADBR
