Overview
The N74F138D,623, produced by NXP USA Inc., is a 1-of-8 decoder/demultiplexer integrated circuit. This device is part of the 74F series and is widely used in various digital systems for decoding and demultiplexing functions. It is particularly useful in applications such as microprocessors, computers, computer networks, frequency counters, and digital signal processors. The N74F138D,623 is known for its reliability and versatility, making it a crucial component in modern electronic designs.
Key Specifications
| Parameter | Value |
|---|---|
| Package Type | 16-pin plastic DIP (N74F138N), 16-pin plastic SO (N74F138D) |
| Input Type | Three binary weighted inputs (A0, A1, A2) |
| Output Type | Eight mutually exclusive, active low outputs (Q0 – Q7) |
| Enable Inputs | Two active low (E0, E1) and one active high (E2) |
| Propagation Delay | Typical 5.8ns |
| Supply Voltage | VCC = 5V ±10% |
| Operating Temperature Range | Commercial: 0°C to +70°C, Industrial: –40°C to +85°C |
| Supply Current | Total: 13mA (typical) |
Key Features
- Demultiplexing capability
- Multiple input enable for easy expansion
- Ideal for memory chip select decoding
- Industrial temperature range available (–40°C to +85°C)
- Can be used as an eight output demultiplexer by using one of the active low enable inputs as the data input and the remaining enable inputs as strobes
Applications
The N74F138D,623 is used in a variety of applications including microprocessors, computers, computer networks, frequency counters, and digital signal processors. It is also suitable for memory chip select decoding and can be expanded to create more complex decoding systems using multiple devices
Q & A
- What is the primary function of the N74F138D,623? The primary function is to act as a 1-of-8 decoder/demultiplexer.
- How many inputs and outputs does the N74F138D,623 have? It has three binary weighted inputs (A0, A1, A2) and eight mutually exclusive, active low outputs (Q0 – Q7).
- What are the enable inputs for the N74F138D,623? The device features two active low enable inputs (E0, E1) and one active high enable input (E2).
- What is the typical propagation delay of the N74F138D,623? The typical propagation delay is 5.8ns.
- What is the operating temperature range for the N74F138D,623? The commercial range is 0°C to +70°C, and the industrial range is –40°C to +85°C.
- Can the N74F138D,623 be used as a demultiplexer? Yes, it can be used as an eight output demultiplexer by using one of the active low enable inputs as the data input and the remaining enable inputs as strobes.
- What are some common applications of the N74F138D,623? Common applications include microprocessors, computers, computer networks, frequency counters, and digital signal processors.
- How can the N74F138D,623 be expanded for more complex decoding? It can be expanded by using multiple devices to create a 1-of-32 decoder with just four 74F138s and one inverter.
- What is the supply voltage for the N74F138D,623? The supply voltage is VCC = 5V ±10%.
- What is the total supply current for the N74F138D,623? The total supply current is typically 13mA.
