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TYPES SN54221, SN54LS221, SN74221, SN74LS221 DUAL MONOSTABLE MULTIVIBRATORS WITH SCHMITT-TRIGGER INPUTS
SN 64221, S N 6 4 L S 2 2 Ì . . . J O R W P A C K A G E SN 74221, SN 74LS221 . ,, J O R N P A C