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74LS47 BCD to 7-segment Decoder 16 pin DIP Driver IC

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74LS47 BCD to 7-segment Common Anode 16 pin DIP Decoder Driver IC

The 74LS47 IC boasts a pair of active-low outputs tailored for driving common-anode LEDs or incandescent indicators. When fed a binary-coded decimal as input, it seamlessly transforms it into a corresponding pattern for illuminating a 7-segment display, showcasing the numerical range from zero to nine. This encoding process represents each digit’s value through its respective 4-bit binary sequence (BCD).

Furthermore, a BCD to 7 Segment decoder employs specialized combinational logic circuitry to effectuate the conversion of BCD decimal digits into the 7-segment display format.

This comprehensive guide provides detailed insights into the 74LS47 decoder, including pin configurations, working, circuit, and more details, offering a clear and informative overview of the functions of the 74LS47 IC.

Pin Description:

Pin No
Function
Name
1
BCD Input 2
A1
2
BCD Input 3
A2
3
Display test; Active low
LT
4
Ripple blanking output; Active low
RBO
5
Ripple blanking input; Active low
RBI
6
BCD Input 4
A3
7
BCD Input 1
A0
8
Ground (0V)
Ground
9
Segment outputs; Active low
e
10
d
11
c
12
b
13
a
14
g
15
f
16
Supply voltage; 5V (4.75V – 5.25V)
Vcc
  • Operating voltage range: +4.75 to +5.25V
  • Recommended operating voltage: +5V
  • Maximum supply voltage:7V
  • Maximum current allowed to draw through each gate output: 8mA
  • TTL outputs
  • Low power consumption
  • Typical Rise Time: 18ns
  • Typical Fall Time: 18ns
  • Operating temperature:0°C  to 70°C
  • Storage Temperature: -65°C  to 150°C

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