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74HC47 - BCD to 7-Segment Decoder/Driver IC

74HC47 - BCD to 7-Segment Decoder/Driver IC

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  • Open-collector outputs 
  • Drive indicator segments directly 
  • Cascadable zero-suppression capability 
  • Lamp test input

74HC47 - BCD to 7-Segment Decoder/Driver IC

The 74HC Series 74HC47 accepts four lines of BCD (8421) input data, generates their complements internally and decodes the data with seven AND/OR gates having open-collector outputs to drive indicator segments directly. Each segment output is guaranteed to sink 24 mA in the ON (LOW) state and withstand 15V in the OFF (HIGH) state with a maximum leakage current of 250 µA. Auxiliary inputs provided blanking, lamp test and cascadable zero-suppression functions.


Pinout of 74HC47 IC

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Supply Voltage (VCC) 7 V
Input Voltage (VI) 7 V
Operating free-air temperature range 0°C to +70°C 
Storage temperature range –65°C to +150°C

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1.What is the function of 74HC47 IC?

  • The 74HC47 is a binary-coded decimal (BCD) to 7-segment decoder/driver IC that converts BCD data to 7-segment display outputs for operating a 7-segment LED display.

2.Can the 74HC47 IC drive common cathode or common anode displays?

  • The 74HC47 IC can drive either common cathode or common anode displays, depending on the connection made to the COM pin. When the COM Pin is connected to Vcc, the outputs are active low, allowing the IC to drive a common cathode display. When the COM pin is connected to GND, the outputs are active high, allowing the IC to drive a common anode display.