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.
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 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 |
74LS47 Pinout Diagram
74LS47 Pin Description
| Pin No | 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 Circuit
Applications
- It may also be used for data distribution i.e. demultiplexing.
- It is used in code conversions
74LS47 Alternative Equivalent
74LS48
Download 74LS47 BCD to 7-segment Decoder/Driver (Open Collector) Datasheet from the link given below.
