74155 IC Dual 2-to-4 Line Decoders/Demultiplexer DIP-16
The 74155 IC Dual 2-to-4 Line Decoders/Demultiplexes DIP-16, designed for digital logic and data routing applications. It contains two independent 2-to-4 decoders that can also function as demultiplexes, providing flexibility in digital circuit design. Each decoder accepts two binary select inputs and provides four mutually exclusive active-low outputs. Built with TTL (Transistor-Transistor Logic) technology, the 74155 offers fast switching, high noise immunity, and reliable performance. It is widely used in address decoding, data distribution, memory selection, and digital control systems in both educational and industrial applications.
Features
- Contains two independent 2-to-4 line decoders/demultiplexes.
- Active-low outputs for easy interface with TTL and CMOS logic.
- Can be used as a decoder or demultiplexer.
- High-speed TTL logic performance.
- Low power consumption and high noise immunity.
- Enable inputs allow flexible control and cascading capability.
- Wide operating voltage range (typically 4.75V to 5.25V).
- Standard 16-pin dual in-line (DIP) package for easy prototyping.
- Compatible with other TTL logic ICs.
- Ideal for address decoding, data routing, and logic control applications.
Pinout Configuration
| Pin No. | Pin Name | Description |
|---|---|---|
| 1 | 1C | Input C (Control Input for Decoder 1) |
| 2 | 1G̅ | Enable Input (Active LOW) for Decoder 1 |
| 3 | B | Binary Input B (Shared between both decoders) |
| 4 | 1Y3 | Output Y3 of Decoder 1 (Active LOW) |
| 5 | 1Y2 | Output Y2 of Decoder 1 (Active LOW) |
| 6 | 1Y1 | Output Y1 of Decoder 1 (Active LOW) |
| 7 | 1Y0 | Output Y0 of Decoder 1 (Active LOW) |
| 8 | GND | Ground (0V) |
| 9 | 2Y0 | Output Y0 of Decoder 2 (Active LOW) |
| 10 | 2Y1 | Output Y1 of Decoder 2 (Active LOW) |
| 11 | 2Y2 | Output Y2 of Decoder 2 (Active LOW) |
| 12 | 2Y3 | Output Y3 of Decoder 2 (Active LOW) |
| 13 | A | Binary Input A (Shared between both decoders) |
| 14 | 2G̅ | Enable Input (Active LOW) for Decoder 2 |
| 15 | 2C | Input C (Control Input for Decoder 2) |
| 16 | VCC | Supply Voltage (+5V) |
Specifications
| Parameter | Value / Description |
| IC Function | Dual 2-Line to 4-Line Decoder / Demultiplexer |
| Logic Family | TTL (Transistor-Transistor Logic) |
| Number of Decoders | 2 Independent Decoders |
| Number of Inputs (per Decoder) | 2 Data Inputs + 1 Enable Input |
| Number of Outputs (per Decoder) | 4 Active-Low Outputs |
| Output Type | Active Low |
| Propagation Delay Time | 20 nsec |
| Operating Voltage (Vcc) | 4.75V to 5.25V |
| Typical Supply Voltage | 5V |
| Input HIGH Voltage (VIH) Min | 2.0V |
| Input LOW Voltage (VIL) Max | 0.8V |
| Output HIGH Voltage (VOH) Min | 2.4V |
| Output LOW Voltage (VOL) Max | 0.4V |
| Power Dissipation | 80 mW |
| Operating Temperature Range | 0°C to +70°C |
| Package Type | DIP-16 (Dual In-line Package) |
| Mounting Type | Through Hole |
| Logic Compatibility | TTL and CMOS |
Applications
- Memory address decoding in microprocessor systems.
- Data routing and signal demultiplexing circuits.
- Digital logic and control circuit design.
- Binary-to-decimal decoding applications.
- Input/output selection in digital systems.
- Multiprocessor communication and data distribution.
- Display decoding and segment selection circuits.
- Logic level translation and control signal generation.
- Embedded systems and automation projects.
- Educational experiments and digital logic training kits.
Package Contents
- 1 x 74155 IC Dual 2-to-4 Line Decoders/Demultiplexer DIP-16
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