SN74LS221DBG4
SN74LS221DBR
SN74LS221DBRE4
SN74LS221DBRG4
SN74LS221DE4
SN74LS221DG4
SN74LS221DR
SN74LS221DR-04+
SN74LS221DRE4
SN74LS221DRG4