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74F51 Dual 2-wide 2-input, 2-wise 3-input AND-OR-invert gate PHILIPS

74F51PC Dual 2-Wide 2-Input; 2-Wide 3-Input AND-OR-Invert Gate FAIRCHILD

74F51SC Dual 2-Wide 2-Input; 2-Wide 3-Input AND-OR-Invert Gate FAIRCHILD

74F51SJ Dual 2-Wide 2-Input; 2-Wide 3-Input AND-OR-Invert Gate FAIRCHILD

74F521 8-bit identity comparator PHILIPS

74F521 8-Bit Identity Comparator FAIRCHILD

74F521MSA 8-Bit Identity Comparator FAIRCHILD

74F521MSA 8-Bit Identity Comparator NSC

74F521PC 8-Bit Identity Comparator FAIRCHILD

74F521PC 8-Bit Identity Comparator NSC

74F521SC 8-Bit Identity Comparator NSC

74F521SC 8-Bit Identity Comparator FAIRCHILD

74F521SJ 8-Bit Identity Comparator FAIRCHILD

74F521SJ 8-Bit Identity Comparator NSC

74F524 8-bit register comparator open-collector 3-State PHILIPS

74F524 8-Bit Registered Comparator FAIRCHILD

74F524PC 8-Bit Registered Comparator FAIRCHILD

74F524SC 8-Bit Registered Comparator FAIRCHILD

74F525 Programmable Counter NSC

74F525PCX Programmable Counter NSC