SN74HC138DRE4

Product Overview

• Category: Integrated Circuit (IC)
• Use: Decoder/Demultiplexer
• Characteristics: High-speed, low-power consumption
• Package: SOIC (Small Outline Integrated Circuit)
• Essence: 3-to-8 line decoder/demultiplexer
• Packaging/Quantity: Tape and Reel, 2500 units per reel

Specifications

• Supply Voltage Range: 2V to 6V
• Input Voltage Range: 0V to VCC
• Output Voltage Range: 0V to VCC
• Maximum Operating Frequency: 50 MHz
• Number of Inputs: 3
• Number of Outputs: 8
• Propagation Delay Time: 13 ns (typical)

Detailed Pin Configuration

The SN74HC138DRE4 has a total of 16 pins. The pin configuration is as follows:

1. GND (Ground)
2. A0 (Input A0)
3. A1 (Input A1)
4. A2 (Input A2)
5. E1 (Enable Input 1)
6. E2 (Enable Input 2)
7. E3 (Enable Input 3)
8. Y0 (Output Y0)
9. Y1 (Output Y1)
10. Y2 (Output Y2)
11. Y3 (Output Y3)
12. Y4 (Output Y4)
13. Y5 (Output Y5)
14. Y6 (Output Y6)
15. Y7 (Output Y7)
16. VCC (Supply Voltage)

Functional Features

The SN74HC138DRE4 is a 3-to-8 line decoder/demultiplexer IC. It takes three binary inputs (A0, A1, A2) and enables one of the eight outputs (Y0 to Y7) based on the input combination. The enable inputs (E1, E2, E3) control the operation of the decoder/demultiplexer.

Advantages and Disadvantages

Advantages: - High-speed operation - Low-power consumption - Compact SOIC package - Wide supply voltage range

Disadvantages: - Limited number of inputs and outputs - Propagation delay may affect timing-sensitive applications

Working Principles

The SN74HC138DRE4 works by decoding the binary input combination into a corresponding output. The enable inputs determine which output is active. When the enable inputs are low, the decoder is disabled and all outputs are in a high-impedance state. When the enable inputs are high, the decoder is enabled and the selected output is driven low while all other outputs remain high.

Detailed Application Field Plans

The SN74HC138DRE4 is commonly used in various digital systems where decoding and demultiplexing functions are required. Some application fields include:

1. Address Decoding: Used in microcontrollers and memory devices to decode address lines and select specific memory locations.
2. Data Demultiplexing: Used in communication systems to separate multiplexed data streams into individual channels.
3. Display Control: Used in display panels to select different segments or digits for driving LED or LCD displays.
4. Programmable Logic Controllers (PLCs): Used in industrial automation systems for controlling and monitoring processes.

Detailed and Complete Alternative Models

1. 74LS138: Similar 3-to-8 line decoder/demultiplexer IC with TTL logic levels.
2. CD74HC138: High-speed CMOS version of the decoder/demultiplexer IC.
3. SN54HC138: Military-grade version of the decoder/demultiplexer IC with extended temperature range.

These alternative models offer similar functionality but may have differences in voltage levels, speed, and temperature range.

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