SN74AHC139NSR

Product Overview

• Category: Integrated Circuit (IC)
• Use: Decoder/Demultiplexer
• Characteristics: High-speed, low-power, 2-to-4 line decoder/demultiplexer
• Package: SOIC (Small Outline Integrated Circuit)
• Essence: Decodes binary information and selects one of four outputs based on the input signals
• Packaging/Quantity: Tape and Reel, 2500 units per reel

Specifications

• Supply Voltage Range: 2 V to 5.5 V
• Input Voltage Range: 0 V to VCC
• Output Voltage Range: 0 V to VCC
• Maximum Operating Frequency: 50 MHz
• Propagation Delay Time: 6 ns (typical)
• Low Power Consumption: ICC = 4 μA (maximum)

Detailed Pin Configuration

The SN74AHC139NSR has a total of 16 pins, which are assigned as follows:

1. A0: Address Input 0
2. A1: Address Input 1
3. G1: Enable Input 1
4. Y0: Output 0
5. Y1: Output 1
6. Y2: Output 2
7. Y3: Output 3
8. G2A: Enable Input 2A
9. G2B: Enable Input 2B
10. VCC: Positive Power Supply
11. Y4: Output 4
12. Y5: Output 5
13. Y6: Output 6
14. Y7: Output 7
15. GND: Ground
16. NC: No Connection

Functional Features

• Decodes two binary address inputs into four mutually exclusive outputs
• Enables cascading for larger demultiplexing applications
• Provides high-speed operation with low power consumption
• Supports wide supply voltage range for compatibility with various systems

Advantages and Disadvantages

Advantages: - High-speed operation allows for quick decoding of input signals - Low power consumption helps in reducing overall system energy usage - Wide supply voltage range ensures compatibility with different power sources

Disadvantages: - Limited to 2-to-4 line decoding, not suitable for larger-scale applications - Propagation delay time may affect real-time applications requiring immediate response

Working Principles

The SN74AHC139NSR is a decoder/demultiplexer IC that takes two binary address inputs (A0 and A1) and decodes them into four mutually exclusive outputs (Y0-Y3). The enable inputs (G1, G2A, and G2B) control the functioning of the IC. When G1 is high, the IC is enabled, and the selected output is determined by the address inputs. The G2A and G2B inputs allow cascading multiple ICs for larger demultiplexing applications.

Detailed Application Field Plans

The SN74AHC139NSR can be used in various applications, including:

1. Address Decoding: Used in microcontrollers and memory systems to decode address lines and select specific memory locations.
2. Data Routing: Enables selection of specific data paths in multiplexed systems, such as communication switches and routers.
3. Display Control: Controls the activation of specific segments or digits in multiplexed displays, like LED or LCD screens.
4. Signal Demultiplexing: Splits a single input signal into multiple outputs based on the address inputs, commonly used in communication systems.

Detailed and Complete Alternative Models

1. CD74HC139E: Similar 2-to-4 line decoder/demultiplexer IC from Texas Instruments.
2. MC74HC139N: Equivalent decoder/demultiplexer IC from ON Semiconductor.
3. 74HC139D: Alternative decoder/demultiplexer IC from NXP Semiconductors.

These alternative models offer similar functionality and can be used as replacements for the SN74AHC139NSR in various applications.

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