The 74LS49 IC features active-high outputs for driving lamp buffer. This circuit incorporates a direct blanking input, segment identification & resultant displays. It also contains an overriding blanking input, which can be used to control the lamp intensity by pulsing or to inhibit the output. The output of the IC always comes in TTL which makes it easy to work with other TTL devices and microcontrollers. The IC 74LS49 is smaller in size and it has a much faster speed which makes it reliable in every kind of device.
What is a BCD to 7-Segment 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.
74LS49 Pinout
| Pin No. | Pin Name | Description |
|---|---|---|
| 1 | B | BCD input of the IC |
| 2 | C | BCD input of the IC |
| 3 | BI | Blanking input |
| 4 | D | BCD input of the IC |
| 5 | A | BCD input of the IC |
| 6 | e | 7 segment output 1 |
| 7 | GND | Ground |
| 8 | d | 7 segment output 2 |
| 9 | c | 7 segment output 3 |
| 10 | b | 7 segment output 4 |
| 11 | a | 7 segment output 5 |
| 12 | g | 7 segment output 6 |
| 13 | f | 7 segment output 7 |
| 14 | Vcc | Chip Supply Voltage |
74LS49 Key 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
- Operating temperature range (C): -20°C to 70°C
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