Encyclopedia Entry: 74LVX139TTR

Product Overview

Category

The 74LVX139TTR belongs to the category of integrated circuits (ICs), specifically a decoder/demultiplexer IC.

Use

This IC is commonly used in digital electronics for decoding and demultiplexing applications. It takes binary input signals and selects one of multiple output lines based on the input code.

Characteristics

• Low-voltage operation: The 74LVX139TTR operates at low voltage levels, typically between 2V and 5.5V.
• High-speed performance: It offers fast switching times, making it suitable for high-frequency applications.
• Compact package: The IC is available in a small-sized TSSOP-16 package, allowing for space-efficient circuit designs.
• Wide temperature range: It can operate reliably within a wide temperature range, from -40°C to 125°C.

Package and Quantity

The 74LVX139TTR is packaged in a Tape and Reel format (TTR) for automated assembly processes. Each reel typically contains 2500 units.

Specifications

• Supply Voltage Range: 2V to 5.5V
• Input Voltage Range: 0V to VCC
• Output Voltage Range: 0V to VCC
• Maximum Operating Frequency: 100 MHz
• Propagation Delay Time: 6 ns (typical)
• Input Current: ±1µA (maximum)
• Output Current: ±8mA (maximum)

Pin Configuration

The 74LVX139TTR has a total of 16 pins, which are assigned specific functions as follows:

1. A0: Binary input line 0
2. A1: Binary input line 1
3. GND: Ground (0V reference)
4. Y0: Output line 0
5. Y1: Output line 1
6. Y2: Output line 2
7. Y3: Output line 3
8. VCC: Positive power supply voltage
9. A2: Binary input line 2
10. A3: Binary input line 3
11. E1: Enable input 1
12. E2: Enable input 2
13. Y4: Output line 4
14. Y5: Output line 5
15. Y6: Output line 6
16. Y7: Output line 7

Functional Features

The 74LVX139TTR decoder/demultiplexer IC offers the following functional features:

• Decoding Capability: It can decode a 4-bit binary code into one of sixteen possible output combinations.
• Demultiplexing Function: The IC can demultiplex a single input signal to any of the eight output lines based on the control inputs.
• Enable Inputs: The E1 and E2 pins allow for individual enable/disable control of the two demultiplexers within the IC.
• High-Speed Operation: With a maximum operating frequency of 100 MHz, it enables rapid data processing.

Advantages and Disadvantages

Advantages

• Low-voltage operation makes it compatible with modern low-power electronic systems.
• Compact package allows for space-saving circuit designs.
• Wide temperature range ensures reliable performance in various environments.
• High-speed operation facilitates efficient data processing.

Disadvantages

• Limited number of output lines (8) compared to other decoder/demultiplexer ICs.
• May require additional external components for certain applications.

Working Principles

The 74LVX139TTR operates based on the principles of digital logic. It utilizes internal circuitry to decode the binary input signals and activate the corresponding output lines. The enable inputs (E1 and E2) control the demultiplexing function, allowing for selective output activation.

Application Field Plans

The 74LVX139TTR finds applications in various fields, including:

1. Address Decoding: It is commonly used in microcontrollers and memory systems to decode address signals.
2. Data Routing: The IC can be employed in data routing and selection circuits, enabling efficient data distribution.
3. Multiplexed Display Control: It can be utilized in multiplexed display systems to control individual segments or digits.

Alternative Models

For similar decoding and demultiplexing requirements, alternative models to consider include:

1. 74HC138: This IC offers similar functionality but operates at a higher voltage range (2V to 6V).
2. CD74HCT238: It provides eight-line decoding capability with active-low outputs.
3. SN74LS154: This model features four-line-to-sixteen-line decoding and has active-low outputs.

These alternative models can be considered based on specific project requirements and compatibility with the overall system design.

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