CMOS 4000-series logic ICs for building digital logic circuits from individual gates and functions.
40xx-series
The 4000 (CMOS) series is one of the two classic logic-IC families, alongside the 7400 (TTL) series, used to build digital circuits from individual logic gates, flip-flops, counters, and other basic functions rather than a full microcontroller. CMOS 4000-series chips are prized for their wide operating voltage range and very low power draw, making them a common choice for battery-powered or voltage-flexible digital logic projects and for learning how digital logic actually works at the gate level.
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