CD74AC138E

Product Overview

• Category: Integrated Circuit (IC)
• Use: Decoder/Demultiplexer
• Characteristics: High-speed, low-power consumption
• Package: 16-pin DIP (Dual In-line Package)
• Essence: Decodes binary information into multiple output lines
• Packaging/Quantity: Available in reels of 2500 units

Specifications

• Supply Voltage Range: 2V to 6V
• Input Voltage Range: 0V to VCC
• Output Voltage Range: 0V to VCC
• Maximum Operating Frequency: 125 MHz
• Propagation Delay Time: 5 ns
• Operating Temperature Range: -40°C to +85°C

Detailed Pin Configuration

The CD74AC138E has a total of 16 pins. The pin configuration is as follows:

1. GND (Ground)
2. A0 (Address Input)
3. A1 (Address Input)
4. A2 (Address Input)
5. E1 (Enable Input)
6. Y0 (Output)
7. Y1 (Output)
8. Y2 (Output)
9. Y3 (Output)
10. Y4 (Output)
11. Y5 (Output)
12. Y6 (Output)
13. Y7 (Output)
14. VCC (Positive Power Supply)
15. E2 (Enable Input)
16. NC (No Connection)

Functional Features

The CD74AC138E is a 3-to-8 line decoder/demultiplexer IC. It takes three address inputs (A0, A1, and A2) and two enable inputs (E1 and E2). Based on the combination of these inputs, it selects one of the eight outputs (Y0 to Y7) and activates it. This allows the decoding of binary information into multiple output lines.

Advantages and Disadvantages

Advantages: - High-speed operation - Low-power consumption - Wide supply voltage range - Compact 16-pin DIP package

Disadvantages: - Limited number of address inputs (3 bits) - No internal pull-up or pull-down resistors

Working Principles

The CD74AC138E works on the principle of binary decoding. The three address inputs (A0, A1, and A2) represent a binary code, which is decoded to select one of the eight outputs (Y0 to Y7). The enable inputs (E1 and E2) control the activation of the selected output. When the appropriate combination of address inputs and enable inputs is applied, the corresponding output becomes active, while all other outputs remain inactive.

Detailed Application Field Plans

The CD74AC138E is widely used in various digital systems and applications, including:

1. Memory Address Decoding: It is commonly used in microprocessors and microcontrollers for decoding memory addresses and selecting specific memory locations.
2. Data Routing: It can be used in data communication systems to route data signals to different destinations based on the input address.
3. Display Multiplexing: It is utilized in multiplexed display systems to select individual segments or digits of a display unit.
4. Programmable Logic Controllers (PLCs): It finds application in PLCs for controlling and selecting different input/output modules based on the address inputs.

Detailed and Complete Alternative Models

Some alternative models to CD74AC138E that serve similar functions are:

1. 74HC138: This is a CMOS version of the decoder/demultiplexer IC with similar specifications and pin configuration.
2. CD4514: This is a 4-to-16 line decoder/demultiplexer IC with additional address inputs and outputs.
3. SN74LS138: This is a TTL version of the decoder/demultiplexer IC with similar characteristics and pin configuration.

These alternative models can be considered based on specific requirements and compatibility with the existing system.

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