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74139 Dual Decoder-Demux IC

74139 Dual Decoder-Demux IC 74139 Dual Decoder-Demux IC
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Name

74139 Dual Decoder-Demux IC

Description

The 74139 is a dual decoder-demultiplexer integrated circuit (IC) that is widely used in digital electronic systems. It is a 16-pin dual in-line package (DIP) device that provides two independent 2-line-to-4-line decoders/demultiplexers.

Functionality

  • Decoder: The device can decode two binary input lines (A and B) to select one of four output lines (Y0-Y3).
  • Demultiplexer (Demux): The IC can also be used as a demultiplexer, where it takes a single input signal and directs it to one of four output lines, depending on the binary input code.
The 74139 IC is designed to perform two primary functions

Key Features

  • Dual Independent Channels: The 74139 IC has two independent channels, each with its own set of input and output pins. This allows for two separate decoder-demux operations to be performed simultaneously.
  • 2-Line-to-4-Line Decoding: Each channel can decode two binary input lines (A and B) to select one of four output lines (Y0-Y3).
  • Active-Low Outputs: The output lines (Y0-Y3) are active-low, meaning that a logic low (0) is asserted when the corresponding output is selected.
  • Enable Input: Each channel has an enable input (G) that can be used to disable the output lines when the enable input is logic high (1).
  • High-Speed Operation: The 74139 IC is capable of operating at high speeds, making it suitable for use in high-frequency digital systems.
  • Low Power Consumption: The device has a relatively low power consumption, making it suitable for use in battery-powered or power-sensitive applications.
  • Wide Operating Temperature Range: The 74139 IC can operate over a wide temperature range, typically from -40C to 85C.

Pinout

The 74139 IC has a 16-pin DIP package with the following pinout

| Pin Number | Pin Name | Function |

| --- | --- | --- |

| 1 | G1 | Enable Input (Channel 1) |

| 2 | A1 | Input Line A (Channel 1) |

| 3 | B1 | Input Line B (Channel 1) |

| 4 | Y0 | Output Line 0 (Channel 1) |

| 5 | Y1 | Output Line 1 (Channel 1) |

| 6 | Y2 | Output Line 2 (Channel 1) |

| 7 | Y3 | Output Line 3 (Channel 1) |

| 8 | VCC | Positive Supply Voltage |

| 9 | GND | Ground |

| 10 | Y3 | Output Line 3 (Channel 2) |

| 11 | Y2 | Output Line 2 (Channel 2) |

| 12 | Y1 | Output Line 1 (Channel 2) |

| 13 | Y0 | Output Line 0 (Channel 2) |

| 14 | B2 | Input Line B (Channel 2) |

| 15 | A2 | Input Line A (Channel 2) |

| 16 | G2 | Enable Input (Channel 2) |

Applications

The 74139 dual decoder-demux IC is commonly used in various digital systems, including

Digital multiplexers and demultiplexers

Data routers and switches

Microprocessor-based systems

Digital communication systems

Logic circuits and controllers

Conclusion

The 74139 dual decoder-demux IC is a versatile and widely used component in digital electronic systems. Its dual independent channels, high-speed operation, and low power consumption make it an ideal choice for a variety of applications.

Pin Configuration

  • 74139 Dual Decoder-Demux IC Pinout Explanation
  • The 74139 is a popular Dual Decoder-Demultiplexer IC used in various digital electronics and IoT applications. It consists of two independent 2-line to 4-line decoders/demultiplexers, each with a common enable input and individual strobe inputs. Here's a detailed explanation of each pin:
  • Pin 1: E1 (Enable Input 1)
  • - This pin is the enable input for the first decoder-demultiplexer.
  • - A low signal on this pin enables the decoder-demultiplexer, while a high signal disables it.
  • Pin 2: A1 (Input A 1)
  • - This pin is one of the two input lines for the first decoder-demultiplexer.
  • - It's used to select one of the four output lines (Y0-Y3) based on the combination of A1 and A2 inputs.
  • Pin 3: A2 (Input A 2)
  • - This pin is the second input line for the first decoder-demultiplexer.
  • - It's used in combination with A1 to select one of the four output lines (Y0-Y3).
  • Pin 4: Y0 (Output Y 0)
  • - This pin is one of the four output lines for the first decoder-demultiplexer.
  • - The output state is determined by the combination of A1 and A2 inputs and the enable signal E1.
  • Pin 5: Y1 (Output Y 1)
  • - This pin is the second output line for the first decoder-demultiplexer.
  • - The output state is determined by the combination of A1 and A2 inputs and the enable signal E1.
  • Pin 6: Y2 (Output Y 2)
  • - This pin is the third output line for the first decoder-demultiplexer.
  • - The output state is determined by the combination of A1 and A2 inputs and the enable signal E1.
  • Pin 7: Y3 (Output Y 3)
  • - This pin is the fourth output line for the first decoder-demultiplexer.
  • - The output state is determined by the combination of A1 and A2 inputs and the enable signal E1.
  • Pin 8: GND (Ground)
  • - This pin is the ground connection for the IC.
  • Pin 9: E2 (Enable Input 2)
  • - This pin is the enable input for the second decoder-demultiplexer.
  • - A low signal on this pin enables the decoder-demultiplexer, while a high signal disables it.
  • Pin 10: A3 (Input A 3)
  • - This pin is one of the two input lines for the second decoder-demultiplexer.
  • - It's used to select one of the four output lines (Y4-Y7) based on the combination of A3 and A4 inputs.
  • Pin 11: A4 (Input A 4)
  • - This pin is the second input line for the second decoder-demultiplexer.
  • - It's used in combination with A3 to select one of the four output lines (Y4-Y7).
  • Pin 12: Y4 (Output Y 4)
  • - This pin is one of the four output lines for the second decoder-demultiplexer.
  • - The output state is determined by the combination of A3 and A4 inputs and the enable signal E2.
  • Pin 13: Y5 (Output Y 5)
  • - This pin is the second output line for the second decoder-demultiplexer.
  • - The output state is determined by the combination of A3 and A4 inputs and the enable signal E2.
  • Pin 14: Y6 (Output Y 6)
  • - This pin is the third output line for the second decoder-demultiplexer.
  • - The output state is determined by the combination of A3 and A4 inputs and the enable signal E2.
  • Pin 15: Y7 (Output Y 7)
  • - This pin is the fourth output line for the second decoder-demultiplexer.
  • - The output state is determined by the combination of A3 and A4 inputs and the enable signal E2.
  • Pin 16: VCC (Supply Voltage)
  • - This pin is the positive supply voltage pin for the IC.
  • Connection Structure:
  • To connect the 74139 Dual Decoder-Demux IC:
  • 1. Connect pin 8 (GND) to the ground terminal of your circuit.
  • 2. Connect pin 16 (VCC) to the positive supply voltage (typically 5V) of your circuit.
  • 3. Connect the input signals to pins 2 (A1), 3 (A2), 10 (A3), and 11 (A4) according to your application's requirements.
  • 4. Connect the enable signals to pins 1 (E1) and 9 (E2) to control the decoder-demultiplexers.
  • 5. Connect the output lines to pins 4 (Y0), 5 (Y1), 6 (Y2), 7 (Y3), 12 (Y4), 13 (Y5), 14 (Y6), and 15 (Y7) according to your application's requirements.
  • Note: Ensure proper voltage levels and signal logic for the inputs, enables, and outputs to avoid damage to the IC or incorrect operation.
  • I hope this detailed explanation helps you understand the 74139 Dual Decoder-Demux IC pinout and connection structure!

Code Examples

74139 Dual Decoder-Demux IC Documentation
Overview
The 74139 is a dual decoder-demux IC that can be used to decode binary data and selectively enable one of multiple output lines based on the input code. It is commonly used in digital electronics and microcontroller-based projects for addressing, decoding, and demultiplexing applications.
Pinout and Functional Description
The 74139 IC has 16 pins, with the following pinout:
Pins 1-4: A, B, C, and D input pins (binary code inputs)
 Pins 5-10: O0-O5 output pins (active low)
 Pins 11-12: Enable inputs (active low)
 Pin 13: VCC (positive power supply)
 Pin 14: GND (ground)
 Pins 15-16: O6-O7 output pins (active low)
The IC operates as follows:
When the enable inputs (pins 11 and 12) are low, the IC decodes the binary code input (pins 1-4) and selectively enables one of the output lines (pins 5-10 and 15-16).
 The output lines are active low, meaning they are pulled low when the corresponding binary code is input.
Code Examples
Example 1: Basic Decoding and Demultiplexing
In this example, the 74139 IC is used to decode a 2-bit binary code and selectively enable one of four output lines.
```c
// Define the input pins
#define A 2 // Pin 2 of Arduino board
#define B 3 // Pin 3 of Arduino board
// Define the output pins
#define O0 4 // Pin 4 of Arduino board
#define O1 5 // Pin 5 of Arduino board
#define O2 6 // Pin 6 of Arduino board
#define O3 7 // Pin 7 of Arduino board
void setup() {
  pinMode(A, INPUT);
  pinMode(B, INPUT);
  pinMode(O0, OUTPUT);
  pinMode(O1, OUTPUT);
  pinMode(O2, OUTPUT);
  pinMode(O3, OUTPUT);
}
void loop() {
  int[code = (digitalRead(A) << 1) | digitalRead(B);
  switch (code) {
    case 0b00:
      digitalWrite(O0, LOW);
      digitalWrite(O1, HIGH);
      digitalWrite(O2, HIGH);
      digitalWrite(O3, HIGH);
      break;
    case 0b01:
      digitalWrite(O0, HIGH);
      digitalWrite(O1, LOW);
      digitalWrite(O2, HIGH);
      digitalWrite(O3, HIGH);
      break;
    case 0b10:
      digitalWrite(O0, HIGH);
      digitalWrite(O1, HIGH);
      digitalWrite(O2, LOW);
      digitalWrite(O3, HIGH);
      break;
    case 0b11:
      digitalWrite(O0, HIGH);
      digitalWrite(O1, HIGH);
      digitalWrite(O2, HIGH);
      digitalWrite(O3, LOW);
      break;
  }
  delay(100);
}
```
Example 2: Using both Decoders of the 74139 IC
In this example, both decoders of the 74139 IC are used to decode two separate 2-bit binary codes and selectively enable one of eight output lines.
```c
// Define the input pins
#define A1 2 // Pin 2 of Arduino board
#define B1 3 // Pin 3 of Arduino board
#define A2 8 // Pin 8 of Arduino board
#define B2 9 // Pin 9 of Arduino board
// Define the output pins
#define O0 4 // Pin 4 of Arduino board
#define O1 5 // Pin 5 of Arduino board
#define O2 6 // Pin 6 of Arduino board
#define O3 7 // Pin 7 of Arduino board
#define O4 10 // Pin 10 of Arduino board
#define O5 11 // Pin 11 of Arduino board
#define O6 12 // Pin 12 of Arduino board
#define O7 13 // Pin 13 of Arduino board
void setup() {
  pinMode(A1, INPUT);
  pinMode(B1, INPUT);
  pinMode(A2, INPUT);
  pinMode(B2, INPUT);
  pinMode(O0, OUTPUT);
  pinMode(O1, OUTPUT);
  pinMode(O2, OUTPUT);
  pinMode(O3, OUTPUT);
  pinMode(O4, OUTPUT);
  pinMode(O5, OUTPUT);
  pinMode(O6, OUTPUT);
  pinMode(O7, OUTPUT);
}
void loop() {
  int code1 = (digitalRead(A1) << 1) | digitalRead(B1);
  int code2 = (digitalRead(A2) << 1) | digitalRead(B2);
  
  switch (code1) {
    case 0b00:
      switch (code2) {
        case 0b00:
          digitalWrite(O0, LOW);
          digitalWrite(O1, HIGH);
          digitalWrite(O2, HIGH);
          digitalWrite(O3, HIGH);
          digitalWrite(O4, HIGH);
          digitalWrite(O5, HIGH);
          digitalWrite(O6, HIGH);
          digitalWrite(O7, HIGH);
          break;
        case 0b01:
          digitalWrite(O0, HIGH);
          digitalWrite(O1, LOW);
          digitalWrite(O2, HIGH);
          digitalWrite(O3, HIGH);
          digitalWrite(O4, HIGH);
          digitalWrite(O5, HIGH);
          digitalWrite(O6, HIGH);
          digitalWrite(O7, HIGH);
          break;
        case 0b10:
          digitalWrite(O0, HIGH);
          digitalWrite(O1, HIGH);
          digitalWrite(O2, LOW);
          digitalWrite(O3, HIGH);
          digitalWrite(O4, HIGH);
          digitalWrite(O5, HIGH);
          digitalWrite(O6, HIGH);
          digitalWrite(O7, HIGH);
          break;
        case 0b11:
          digitalWrite(O0, HIGH);
          digitalWrite(O1, HIGH);
          digitalWrite(O2, HIGH);
          digitalWrite(O3, LOW);
          digitalWrite(O4, HIGH);
          digitalWrite(O5, HIGH);
          digitalWrite(O6, HIGH);
          digitalWrite(O7, HIGH);
          break;
      }
      break;
    case 0b01:
      switch (code2) {
        case 0b00:
          digitalWrite(O0, HIGH);
          digitalWrite(O1, HIGH);
          digitalWrite(O2, HIGH);
          digitalWrite(O3, HIGH);
          digitalWrite(O4, LOW);
          digitalWrite(O5, HIGH);
          digitalWrite(O6, HIGH);
          digitalWrite(O7, HIGH);
          break;
        case 0b01:
          digitalWrite(O0, HIGH);
          digitalWrite(O1, HIGH);
          digitalWrite(O2, HIGH);
          digitalWrite(O3, HIGH);
          digitalWrite(O4, HIGH);
          digitalWrite(O5, LOW);
          digitalWrite(O6, HIGH);
          digitalWrite(O7, HIGH);
          break;
        case 0b10:
          digitalWrite(O0, HIGH);
          digitalWrite(O1, HIGH);
          digitalWrite(O2, HIGH);
          digitalWrite(O3, HIGH);
          digitalWrite(O4, HIGH);
          digitalWrite(O5, HIGH);
          digitalWrite(O6, LOW);
          digitalWrite(O7, HIGH);
          break;
        case 0b11:
          digitalWrite(O0, HIGH);
          digitalWrite(O1, HIGH);
          digitalWrite(O2, HIGH);
          digitalWrite(O3, HIGH);
          digitalWrite(O4, HIGH);
          digitalWrite(O5, HIGH);
          digitalWrite(O6, HIGH);
          digitalWrite(O7, LOW);
          break;
      }
      break;
    case 0b10:
      switch (code2) {
        case 0b00:
          digitalWrite(O0, HIGH);
          digitalWrite(O1, HIGH);
          digitalWrite(O2, HIGH);
          digitalWrite(O3, HIGH);
          digitalWrite(O4, HIGH);
          digitalWrite(O5, HIGH);
          digitalWrite(O6, LOW);
          digitalWrite(O7, HIGH);
          break;
        case 0b01:
          digitalWrite(O0, HIGH);
          digitalWrite(O1, HIGH);
          digitalWrite(O2, HIGH);
          digitalWrite(O3, HIGH);
          digitalWrite(O4, HIGH);
          digitalWrite(O5, HIGH);
          digitalWrite(O6, HIGH);
          digitalWrite(O7, LOW);
          break;
        case 0b10:
          digitalWrite(O0, HIGH);
          digitalWrite(O1, HIGH);
          digitalWrite(O2, HIGH);
          digitalWrite(O3, HIGH);
          digitalWrite(O4, HIGH);
          digitalWrite(O5, HIGH);
          digitalWrite(O6, HIGH);
          digitalWrite(O7, HIGH);
          break;
        case 0b11:
          digitalWrite(O0, HIGH);
          digitalWrite(O1, HIGH);
          digitalWrite(O2, HIGH);
          digitalWrite(O3, HIGH);
          digitalWrite(O4, HIGH);
          digitalWrite(O5, HIGH);
          digitalWrite(O6, HIGH);
          digitalWrite(O7, HIGH);
          break;
      }
      break;
    case 0b11:
      switch (code2) {
        case 0b00:
          digitalWrite(O0, HIGH);
          digitalWrite(O1, HIGH);
          digitalWrite(O2, HIGH);
          digitalWrite(O3, HIGH);
          digitalWrite(O4, HIGH);
          digitalWrite(O5, HIGH);
          digitalWrite(O6, HIGH);
          digitalWrite(O7, LOW);
          break;
        case 0b01:
          digitalWrite(O0, HIGH);
          digitalWrite(O1, HIGH);
          digitalWrite(O2, HIGH);
          digitalWrite(O3, HIGH);
          digitalWrite(O4, HIGH);
          digitalWrite(O5, HIGH);
          digitalWrite(O6, HIGH);
          digitalWrite(O7, HIGH);
          break;
        case 0b10:
          digitalWrite(O0, HIGH);
          digitalWrite(O1, HIGH);
          digitalWrite(O2, HIGH);
          digitalWrite(O3, HIGH);
          digitalWrite(O4, HIGH);
          digitalWrite(O5, HIGH);
          digitalWrite(O6, HIGH);
          digitalWrite(O7, HIGH);
          break;
        case 0b11:
          digitalWrite(O0, HIGH);
          digitalWrite(O1, HIGH);
          digitalWrite(O2, HIGH);
          digitalWrite(O3, HIGH);
          digitalWrite(O4, HIGH);
          digitalWrite(O5, HIGH);
          digitalWrite(O6, HIGH);
          digitalWrite(O7, HIGH);
          break;
      }
      break;
  }
  delay(100);
}
```
Note: The above code examples are written in Arduino syntax and are for illustrative purposes only. The actual implementation may vary depending on the specific application and microcontroller used.