Description
The 74HC138 DIP is a high-speed, low-power 3-to-8 line decoder/demultiplexer. This IC is designed to take a 3-bit binary input and activate one of eight outputs while keeping the others low. It features three enable inputs, allowing it to be used in cascading applications and expanded address decoding. The 74HC138 is widely used in memory address decoding, logic signal routing, and microprocessor-based control systems.
Operating within a voltage range of 2V to 6V, the 74HC138 is fully compatible with both CMOS and TTL logic families. It offers a fast propagation delay of approximately 15 ns at 5V, making it suitable for high-speed digital circuits. The IC provides active-low outputs, meaning that the selected output goes low while the others remain high.
Packaged in a DIP-16 (Dual In-line Package), the 74HC138 is easy to use in breadboard and PCB designs. It is widely used in microprocessor-based applications, memory address decoding, and logic signal control circuits.
Specifications:
| Parameter | Value |
|---|---|
| Logic Family | 74HC |
| Function | 3-to-8 Line Decoder/Demultiplexer |
| Operating Voltage | 2V – 6V |
| Propagation Delay | Approx. 15 ns at 5V |
| Number of Input Lines | 3 |
| Number of Output Lines | 8 (Active-Low) |
| Enable Inputs | 3 (G1, G2A, G2B) |
| Output Type | Active-Low |
| Package Type | DIP-16 (Dual In-line Package) |
Applications:
- Microprocessor memory address decoding
- Logic demultiplexing
- Signal routing and control
- Chip-select applications in embedded systems
- Binary-to-decimal decoding
The 74HC138 DIP is an essential component in digital logic circuits, offering reliable performance in address decoding and control signal distribution. Its high-speed operation and compatibility with standard logic families make it a preferred choice for various electronic applications.
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