The 74LS47 IC features active low outputs designed for driving common – anode LEDs or incandescent indicators directly. It accepts a binary coded decimal as input and converts it into a pattern to drive a seven-segment for displaying digits 0 to 9. Binary coded decimal (BCD) is an encoding in which each digit of a number is represented by its own binary sequence (usually of four bits).
What is a BCD to 7-Segment Display Decoder?
A BCD to Seven Segment decoder is a combinational logic circuit that accepts a decimal digit in BCD (input) and generates appropriate outputs for the segments to display the input decimal digit.
74LS47 Pinout
74LS47 Pin Configuration
| Pin No | Pin Name | Description |
|---|---|---|
| 1 | B | BCD input of the IC |
| 2 | C | BCD input of the IC |
| 3 | Display test/Lamp test | To test the display LED |
| 4 | Blank Input | To turn-off the LEDs of the display |
| 5 | Store | Store or strobe a BCD code |
| 6 | D | BCD input of the IC |
| 7 | A | BCD input of the IC |
| 8 | GND | Ground Pin |
| 9 | e | 7 segment output 1 |
| 10 | d | 7 segment output 2 |
| 11 | c | 7 segment output 3 |
| 12 | b | 7 segment output 4 |
| 13 | a | 7 segment output 5 |
| 14 | g | 7 segment output 6 |
| 15 | f | 7 segment output 7 |
| 16 | VCC | Supply Voltage |
74LS47 Features & Specifications
- Function: Decoder, Demultiplexer
- Technology Family: LS
- VCC (Min): 4.75V
- VCC (Max): 5.25V
- Channels: 1
- Voltage (Nom): 5V
- Max Frequency at normal Voltage: 35Mhz
- tpd at normal Voltage (Max): 100 nsec
- Configuration: 4:7
- Type: Open-Collector
- IOL (Max): 3.2mA
- IOH (Max): -0.05mA
- Rating: Catalog
- Operating temperature range (C): 0 to 70
- Bits (#): 7
- Digital input leakage (Max): 5uA
- ESD CDM (kV): 0.75
- ESD HBM (kV): 2
Applications
- It is usually used in devices such as a display for calculators, digital watches & displays, etc.
You can download this Datasheet for 74LS47 BCD to 7-Segment Display Decoder from the link given below:
See Also: 7407 Hex Buffer IC | 74LS20 Dual 4 – Input NAND IC | 74LS00 Quad Two Input NAND Gate
