The 4000 series is the general classification referring to the industry standard
integrated circuits which implement a variety of
logic functions using
CMOS technology. They were introduced by
RCA as CD4000 COS/MOS in
1968, as a lower power and more versatile alternative to the
7400 series of
TTL logic chips. Almost all IC manufacturers active during the era fabricated chips from this series. RCA sometimes advertised the line as COSMOS, standing for Complimentary Symmetry Metal Oxide Semiconductor.
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