74LS47 BCD to 7-segment Decoder/Driver (Open Collector)
Package SOIC Series 74LS
74LS47 overview
The 74LS series of integrated circuits (ICs) was one of the most popular logic families of transistor-transistor logic (TTL) logic chips. 74LS series is a bipolar, low-power Schottky IC.74LS47 BCD to 7-segment Decoder/Driver (Open Collector) has full ripple-blanking input/output controls and a lamp test input. patterns for BCD input counts above 9 are unique symbols to authenticate input conditions.
Key specifications
Supply Voltage
4.75 - 5.25Vdc
Maximum Clock Frequency
40Mhz
Power Dissipation
2mW/gate @100kHz
Minimum Output Current
8mA
Propagation Delay
10nS
Fan Out (TTL Loads)
20
Datasheet
47.pdf
74LS47 features
- Accepts Four Line of BCD Input and Converts this to Seven Open Collector Outputs
- Open Collector Outputs require Pull-Up Resistors
- Lamp Test Input
- Operating Temperature up to 70°C
- Standard TTL Switching Voltages
74LS47 pinout
| Pin | Name | Description |
|---|---|---|
| 1 | B | BCD Inputs B |
| 2 | C | BCD Inputs C |
| 3 | LT | Lamp Test Input (Active LOW) |
| 4 | RB0 | Blanking Input (Active LOW) |
| 5 | RB1 | Ripple Blanking Input (Active LOW) |
| 6 | D | BCD Inputs D |
| 7 | A | BCD Inputs A |
| 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 (a) Output (Active LOW) |
| 14 | (g)' | Segment Output g (Active LOW) |
| 15 | (f)' | Segment Output f (Active LOW) |
| 16 | Vcc | Power Supply |
74LS47 applications
- It may also be used for data distribution i.e. demultiplexing.
- It is used in code conversions
More about 74LS47
74LS47 Alternative Equivalent
74LS48
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