MC74ACT138N

Overview

• Category: Integrated Circuit
• Use: Decoder/Demultiplexer
• Characteristics:
  • High-speed operation
  • Low power consumption
  • Wide operating voltage range
• Package: DIP (Dual In-line Package)
• Essence: Digital Logic IC
• Packaging/Quantity: Tube, 25 pieces per tube

Specifications

• Supply Voltage Range: 2.0V to 6.0V
• Input Voltage Range: 0V to VCC
• Output Voltage Range: 0V to VCC
• Operating Temperature Range: -55°C to +125°C
• Propagation Delay Time: 5 ns (typical)
• Output Current: ±24 mA

Pin Configuration

The MC74ACT138N has a total of 16 pins arranged as follows:

┌───┐ A3 ─┤1 16├ ─ VCC A2 ─┤2 15├ ─ Y0 A1 ─┤3 14├ ─ Y1 A0 ─┤4 13├ ─ Y2 G1 ─┤5 12├ ─ Y3 G2A ─┤6 11├ ─ Y4 G2B ─┤7 10├ ─ Y5 G3A ─┤8 9├ ─ Y6 └───┘

Functional Features

• Decodes three binary weighted address inputs (A0, A1, A2) into eight mutually exclusive outputs (Y0-Y7).
• Enables the selected output based on the active low enable inputs (G1, G2A, G2B, G3A).
• Provides a demultiplexing function for various applications.

Advantages

• High-speed operation allows for quick data processing.
• Low power consumption helps in reducing energy usage.
• Wide operating voltage range provides flexibility in different electronic systems.
• DIP package allows for easy integration into circuit boards.

Disadvantages

• Limited number of address inputs restricts the range of decoding possibilities.
• Output current may not be sufficient for certain high-power applications.

Working Principles

The MC74ACT138N is a decoder/demultiplexer IC that takes three binary weighted address inputs and generates eight mutually exclusive outputs. The selected output is determined by the combination of the address inputs and the active low enable inputs. When the enable inputs are at logic low, the corresponding output is enabled, allowing the input signal to pass through.

Detailed Application Field Plans

The MC74ACT138N can be used in various applications, including but not limited to:

1. Address decoding in microcontrollers and microprocessors.
2. Memory selection in digital systems.
3. Data routing in communication systems.
4. Signal demultiplexing in multiplexed display systems.
5. Control signal generation in industrial automation.

Alternative Models

Here are some alternative models that provide similar functionality:

1. SN74LS138
2. CD74HC138
3. 74HCT138
4. 74F138
5. DM74LS138

These models offer comparable features and can be used as substitutes for the MC74ACT138N in different applications.

In conclusion, the MC74ACT138N is a versatile decoder/demultiplexer IC with high-speed operation, low power consumption, and a wide operating voltage range. It is commonly used in various digital systems for address decoding, memory selection, and data routing. While it has some limitations, such as a limited number of address inputs, it offers several advantages and can be easily integrated into circuit boards.