The 7447 is a BCD to 7-segment decoder/driver IC designed for driving common-cathode displays. It converts 4-bit binary-coded decimal (BCD) inputs into segment control outputs (a–g), enabling display of digits 0–9. It features active-low outputs, lamp test (LT), blanking input (BI), and ripple blanking functions. Operating from 2V–6V with low power consumption, it's ideal for numeric display applications in digital clocks, counters, and calculators.
| Display Type | Common Cathode |
|---|---|
| Supply Voltage Range | 2V to 6V |
| Propagation Delay | 15 ns |
| Operating Temperature | -40°C to +85°C |
📄 SN54LS47 datasheet (1883 kB)
| Pin No | Pin Name | Description |
|---|---|---|
| 1 | B | BCD Input B |
| 2 | C | BCD Input C |
| 3 | LT | Lamp Test (active LOW) |
| 4 | BI/RBO | Ripple Blanking Output (active LOW) |
| 5 | RBI | Ripple Blanking Input (active LOW) |
| 6 | D | BCD Input D (MSB) |
| 7 | A | BCD Input A (LSB) |
| 8 | GND | Ground |
| 9 | e | Segment Output e (active LOW) |
| 10 | d | Segment Output d (active LOW) |
| 11 | c | Segment Output c (active LOW) |
| 12 | b | Segment Output b (active LOW) |
| 13 | a | Segment Output a (active LOW) |
| 14 | g | Segment Output g (active LOW) |
| 15 | f | Segment Output f (active LOW) |
| 16 | VCC | Supply Voltage |