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BUY DM7403N https://www.utsource.net/itm/p/11709577.html
IC GATE NAND 4CH 2-INP 14DIP
The DM7403N is a 14-pin DIP (dual in-line package) integrated circuit (IC) manufactured by National Semiconductor. It is a quad 2-input NAND gate, which is a logic gate that produces an output that is false only if both of its inputs are true. Features: * Inputs compatible with TTL levels * Outputs source/sink 24 mA * Outputs can be wired to create AND, OR, and NOT functions * Low power consumption Applications: * Digital logic * Flip-flops * Counters * Data selectors/multiplexers * Address decoding * Timing and control circuits (For reference only)