74191 series datasheets. Manufacturer: Fairchild Semiconductor.

74191 Synchronous 4-Bit Up/Down Counter with Mode Control Datasheet*) 74LS191 Synchronous 4-Bit Up/Down Counter with Mode Control Datasheet*) DM74LS191 Synchronous 4-Bit Up/Down Counter with Mode Control Datasheet*) There are other manufacturers for this components. For more information please check 74191 (National Semiconductor)

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