Encyclopedia Entry: 74VHC139MTR

Product Overview

Category

The 74VHC139MTR belongs to the category of integrated circuits (ICs) and specifically falls under the family of digital multiplexers/demultiplexers.

Use

This product is primarily used in digital electronics for data routing and selection purposes. It allows for efficient control and manipulation of multiple input signals, enabling the user to select specific data inputs and route them to desired outputs.

Characteristics

• High-speed operation: The 74VHC139MTR is designed to operate at high speeds, making it suitable for applications that require quick data processing.
• Low power consumption: This IC is known for its low power consumption, making it energy-efficient and suitable for battery-powered devices.
• Wide operating voltage range: The 74VHC139MTR can operate within a wide voltage range, typically between 2V and 5.5V, providing flexibility in various electronic systems.
• Compact package: It is available in a small-sized TSSOP-16 package, which makes it suitable for space-constrained applications.

Package and Quantity

The 74VHC139MTR is packaged in a Thin Shrink Small Outline Package (TSSOP) with 16 pins. It is commonly available in reels containing a quantity of 2500 units.

Specifications

• Supply Voltage Range: 2V to 5.5V
• Input Voltage Range: 0V to VCC
• Output Voltage Range: 0V to VCC
• Operating Temperature Range: -40°C to +85°C
• Propagation Delay Time: 4.3 ns (typical)
• Maximum Quiescent Current: 1 μA (at 5.5V)

Pin Configuration

The 74VHC139MTR has a total of 16 pins, which are assigned specific functions as follows:

1. A0: Data input A0
2. A1: Data input A1
3. GND: Ground (0V reference)
4. Y0: Output Y0
5. Y1: Output Y1
6. Y2: Output Y2
7. Y3: Output Y3
8. VCC: Positive power supply voltage
9. B1: Data input B1
10. B0: Data input B0
11. /G2: Active-low enable input G2
12. /G1: Active-low enable input G1
13. Y4: Output Y4
14. Y5: Output Y5
15. Y6: Output Y6
16. Y7: Output Y7

Functional Features

The 74VHC139MTR is a dual 2-to-4 line decoder/demultiplexer with active-low enable inputs (/G1 and /G2). It allows the user to select one of four outputs based on the combination of two binary inputs (A0 and A1). The selected output is determined by the logic levels applied to these inputs.

The active-low enable inputs (/G1 and /G2) control the operation of the decoder/demultiplexer. When either /G1 or /G2 is held low, the corresponding output lines are enabled, allowing the data from the input lines (B0 and B1) to appear at the respective outputs (Y0 to Y7).

Advantages and Disadvantages

Advantages

• High-speed operation enables quick data processing.
• Low power consumption makes it suitable for energy-efficient applications.
• Wide operating voltage range provides flexibility in various electronic systems.
• Compact package size allows for space-saving designs.

Disadvantages

• Limited number of output lines (8) may not be sufficient for certain complex applications.
• Lack of built-in protection features against voltage spikes or electrostatic discharge (ESD) events.

Working Principles

The 74VHC139MTR operates based on the principles of digital logic. It utilizes a combination of input signals and control inputs to select and route specific data inputs to the desired outputs. The active-low enable inputs (/G1 and /G2) play a crucial role in enabling or disabling the output lines based on their logic levels.

When the enable inputs are held low, the decoder/demultiplexer is activated, and the selected output lines reflect the data present at the corresponding input lines. By manipulating the binary input signals, the user can control which output line receives the data.

Application Field Plans

The 74VHC139MTR finds extensive use in various digital electronic systems, including but not limited to: - Data routing and selection in microcontrollers and microprocessors - Address decoding in memory systems - Signal routing in communication devices - Input/output (I/O) expansion in embedded systems - Multiplexing/demultiplexing in