sn74ls247n怎么用

The SN74LS247N is a BCD-to-Seven-Segment Decoder/Driver chip. It converts a four-bit BCD (Binary Coded Decimal) input to the corresponding seven-segment display output.

Here are the steps to use the SN74LS247N:

1. Connect power supply: Connect VCC (pin 16) to +5V and GND (pin 8) to ground.

2. Connect input signals: Connect the BCD input signals (A, B, C, D) to the corresponding input pins (pins 1, 2, 6, 7) on the SN74LS247N chip.

3. Connect segment outputs: Connect the seven-segment display anodes to the respective segment output pins (pins 12, 9, 8, 6, 5, 4, 10) of the SN74LS247N chip. The common cathode of the seven-segment display should be connected to ground.

4. Connect enable inputs (optional): The SN74LS247N has two enable inputs, G1 (pin 15) and G2A (pin 14). If you want to control the display output, you can connect these enable inputs to control signals (for example, microcontroller outputs). Connect G1 to +5V if you want the display to be always enabled. Connect G2A to +5V if you want the display to be enabled when the outputs are valid.

5. Connect active low LAMP test input (optional): If you want to test the display segments, connect the LAMP test input (pin 13) to ground. This will turn on all the display segments.

6. Apply BCD input: Set the BCD input (A, B, C, D) to the desired binary value. The seven-segment display will show the corresponding decimal digit.

7. Apply power: Connect the power supply to +5V. The seven-segment display should now show the decimal digit corresponding to the BCD input.

Note: The pin numbers mentioned above are for the DIP (Dual In-line Package) version of the SN74LS247N chip. If you are using a different package, please refer to the datasheet of the chip to locate the correct pin numbers.

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