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Logic Gate

Logic gate ICs: 74xx series NAND, NOR, AND, OR, XOR and inverter gates, 7474 and CD4013 flip-flops, CD4027 JK flip-flops and CD4093 Schmitt triggers.

Digital logic chips for learning, lab work and repairs: 7400 NAND, 7402 NOR, 7404 inverter, 7408 AND, 7410 and 7421 multi-input gates, 7432 OR and 7486 XOR, 7474 and CD4013 D flip-flops, CD4027 JK flip-flops, the CD4050 buffer and the CD4093 Schmitt-trigger NAND.

74xx or 40xx?

74xx (TTL) chips run on 5V. CD40xx (CMOS) chips accept a wide supply range, roughly 3V to 15V, and use very little power. Tie unused inputs to ground or the supply, and fit a 0.1µF capacitor close to each chip’s power pins. IC sockets make chips easy to swap.

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