CD74ACT138ME4

Basic Information Overview

• Category: Integrated Circuit (IC)
• Use: Decoder/Demultiplexer
• Characteristics: High-speed, low-power, 3-to-8 line decoder/demultiplexer
• Package: SOIC (Small Outline Integrated Circuit)
• Essence: Converts a binary input into a corresponding output based on the selected line
• 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
• Operating Temperature Range: -40°C to +85°C
• Propagation Delay Time: 5.5 ns (typical)
• Output Current: ±24 mA

Detailed Pin Configuration

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

Functional Features

• Decodes a 3-bit binary input into one of eight outputs
• Enables cascading multiple devices for larger decoding applications
• Low power consumption and high-speed operation
• Schmitt-trigger inputs for noise immunity
• TTL-compatible inputs and outputs

Advantages

• Compact and space-saving SOIC package
• Wide supply voltage range allows for versatile applications
• High-speed operation enables efficient data processing
• Low power consumption reduces energy requirements
• Noise immunity provided by Schmitt-trigger inputs ensures reliable operation

Disadvantages

• Limited to 3-to-8 line decoding, not suitable for other applications
• Requires external enable signals for proper functioning
• May be sensitive to electrostatic discharge (ESD), requiring proper handling precautions

Working Principles

The CD74ACT138ME4 is a decoder/demultiplexer IC that converts a 3-bit binary input into one of eight corresponding outputs. The selected output line depends on the combination of inputs A0, A1, and A2. The enable inputs E1 and E2 control the operation of the device. When both enable inputs are active, the decoder is enabled, and the selected output line reflects the binary input. If either or both enable inputs are inactive, all output lines are in a high-impedance state.

Detailed Application Field Plans

• Address decoding in microcontrollers and microprocessors
• Memory selection in RAM and ROM systems
• Data routing in multiplexing applications
• Signal demultiplexing in communication systems
• Control signal generation in digital circuits

Detailed and Complete Alternative Models

• SN74LS138: Similar 3-to-8 line decoder/demultiplexer with different characteristics
• CD74HC138: High-speed CMOS version of the decoder/demultiplexer
• CD4514: 4-to-16 line decoder/demultiplexer with additional features

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