NC - No internal connection The ’FCT138T devices are 1-of-8 decoders. These devices accept three binary weighted inputs (A0, A1, A2) and, when enabled, provide eight mutually exclusive active-low outputs (O0-O7).
Datasheets by Manufacturer
74154 — National Semiconductor — 4-Line to 16-Line Decoders/Demultiplexers
7447 — Fairchild Semiconductor — BCD to 7-Segment Decoders/Drivers
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