SN74AHC139DBR

Product Overview

• Category: Integrated Circuit (IC)
• Use: Decoder/Demultiplexer
• Characteristics: High-speed, low-power, dual 2-to-4 line decoder/demultiplexer
• Package: SSOP (Shrink Small Outline Package)
• Essence: A versatile IC that decodes binary information and selects one of four output lines 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)
• Operating Temperature Range: -40°C to +85°C

Detailed Pin Configuration

The SN74AHC139DBR has a total of 16 pins, which are assigned as follows:

1. GND (Ground)
2. A0 (Input A0)
3. A1 (Input A1)
4. E1 (Enable Input 1)
5. Y0 (Output Y0)
6. Y1 (Output Y1)
7. GND (Ground)
8. Y2 (Output Y2)
9. Y3 (Output Y3)
10. E2 (Enable Input 2)
11. B0 (Input B0)
12. B1 (Input B1)
13. VCC (Positive Power Supply)
14. NC (No Connection)
15. NC (No Connection)
16. GND (Ground)

Functional Features

• Dual 2-to-4 Line Decoder/Demultiplexer: The SN74AHC139DBR can decode two separate 2-bit binary inputs and select one of four output lines based on the input combination.
• High-Speed Operation: With a maximum operating frequency of 50 MHz, this IC ensures fast and efficient decoding.
• Low Power Consumption: The SN74AHC139DBR is designed to operate at low power levels, making it suitable for battery-powered devices.
• Schmitt-Trigger Inputs: The inputs are equipped with Schmitt-trigger circuitry, allowing for better noise immunity and signal integrity.

Advantages and Disadvantages

Advantages: - Versatile functionality as both a decoder and demultiplexer - High-speed operation enables quick data processing - Low power consumption extends battery life in portable devices - Schmitt-trigger inputs provide improved noise immunity

Disadvantages: - Limited to dual 2-to-4 line decoding/demultiplexing - May not be suitable for applications requiring more complex decoding capabilities

Working Principles

The SN74AHC139DBR operates by receiving two 2-bit binary inputs (A0, A1) and two enable inputs (E1, E2). Based on the input combination, one of the four output lines (Y0, Y1, Y2, Y3) is selected. The internal circuitry decodes the binary information and activates the corresponding output line. The Schmitt-trigger inputs ensure reliable operation even in the presence of noise or signal fluctuations.

Detailed Application Field Plans

The SN74AHC139DBR finds applications in various fields, including:

1. Digital Electronics: Used in digital systems for address decoding, memory selection, and data routing.
2. Communication Systems: Employed in multiplexing and demultiplexing circuits for data transmission and reception.
3. Industrial Automation: Integrated into control systems for signal routing and device selection.
4. Consumer Electronics: Utilized in remote control units, audio/video equipment, and gaming consoles for input/output selection.

Detailed and Complete Alternative Models

1. SN74AHC139DR: Similar to SN74AHC139DBR but available in SOIC (Small Outline Integrated Circuit) package.
2. CD74HC139E: A compatible alternative from a different manufacturer, available in DIP (Dual In-line Package) format.
3. 74HCT139: An alternative with TTL (Transistor-Transistor Logic) compatibility, suitable for mixed logic systems.

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