The 7447 BCD to 7-Segment Decoder/Driver IC (DIP) converts a 4-bit BCD input into the seven segment signals required to display digits 0–9 on common-anode LED displays. Its open-collector, active-LOW outputs (a–g) can directly sink current for each segment (with external resistors), simplifying numeric display designs in counters, clocks, meters, and student projects. Control pins LT (Lamp Test), BI̅ (Blanking Input), and RBI (Ripple Blanking In) plus RBO (Ripple Blanking Out) support lamp testing, global blanking, and leading-zero suppression when cascading multiple digits. The standard DIP-16 package is breadboard-friendly for quick prototyping.
Key Features
- BCD (A, B, C, D) to 7-segment decode for digits 0–9
- Common-anode display driver with open-collector, active-LOW segment outputs (a–g)
- LT, BI̅, RBI/RBO control pins for lamp test, blanking, and leading-zero suppression
- TTL-compatible inputs; fast, reliable switching at 5V
- DIP-16 package, easy for breadboards and PCBs
Technical Highlights
- Supply voltage: 4.75–5.25 V (TTL)
- Inputs: A, B, C, D (BCD), LT, BI̅, RBI
- Outputs: a, b, c, d, e, f, g (active-LOW), RBO
- Display type: Common-anode 7-segment
- Usage tip: Connect display common anode to +5V, each segment through a current-limiting resistor to the 7447 output.
Applications
- Up/down counters, frequency/clock displays
- Digital clocks, timers, stopwatches
- Microcontroller numeric readouts and lab trainers
- Educational kits and prototype display modules
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