Overview
The MC74AC139DG, produced by onsemi, is a high-speed, dual 1-of-4 decoder/demultiplexer. This device features two independent decoders, each accepting two binary weighted inputs (A0-A1) and providing four mutually exclusive active-LOW outputs (O0-O3). Each decoder includes an active-LOW enable input, which can also be used as a data input for a 4-output demultiplexer application. This component is part of the 74AC and 74ACT series, known for their high-speed operation and compatibility with TTL inputs in the case of the 74ACT139.
Key Specifications
| Parameter | Value | Unit | Conditions |
|---|---|---|---|
| VCC (Supply Voltage) | 2.0 to 6.0 | V | |
| VI (DC Input Voltage) | 0 to VCC | V | |
| VO (DC Output Voltage) | 0 to VCC | V | |
| TA (Operating Ambient Temperature Range) | -40 to 85 | °C | |
| IOH (Output Current - High) | -24 | mA | |
| IOL (Output Current - Low) | 24 | mA | |
| tPLH (Propagation Delay An to On) | 3.0 to 13 | ns | VCC = 5.0 V, CL = 50 pF |
| tPHL (Propagation Delay An to On) | 2.5 to 11 | ns | VCC = 5.0 V, CL = 50 pF |
| CIN (Input Capacitance) | 4.5 | pF | VCC = 5.0 V |
| CPD (Power Dissipation Capacitance) | 40 | pF | VCC = 5.0 V |
Key Features
- High-speed operation
- Dual 1-of-4 decoder/demultiplexer functionality
- Two completely independent decoders
- Active-LOW mutually exclusive outputs
- Outputs source/sink 24 mA
- TTL compatible inputs for the 74ACT139 version
- Pb-Free devices
- Can be used as a function generator providing four minterms of two variables
Applications
The MC74AC139DG is versatile and can be used in various digital logic circuits. Here are some key applications:
- Decoder and demultiplexer functions in digital systems
- Function generation: Each half can generate all four minterms of two variables, reducing the number of packages required in a logic network.
- Data selection and routing in communication systems
- Control logic in industrial and automotive systems
Q & A
- What is the primary function of the MC74AC139DG?
The MC74AC139DG is a high-speed, dual 1-of-4 decoder/demultiplexer.
- How many independent decoders does the MC74AC139DG have?
The device has two independent decoders.
- What is the range of the supply voltage (VCC) for the MC74AC139DG?
The supply voltage range is from 2.0 V to 6.0 V.
- What is the maximum output current for the MC74AC139DG?
The outputs can source/sink up to 24 mA.
- Is the MC74AC139DG Pb-Free?
- What are the typical propagation delays for the MC74AC139DG?
The propagation delays range from 2.5 ns to 13 ns depending on the conditions.
- Can the MC74AC139DG be used as a function generator?
- What are the common applications of the MC74AC139DG?
- What is the operating ambient temperature range for the MC74AC139DG?
- Is the MC74AC139DG compatible with TTL inputs?
