74LS33 series datasheets. Manufacturer: Fairchild Semiconductor.

74LS33 Quad 2-Input NOR Buffer with Open-Collector Outputs Datasheet*) DM74LS33 Quad 2-Input NOR Buffer with Open-Collector Outputs Datasheet*) There are other manufacturers for this components. For more information please check 74LS33 (Motorola)

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