MC74HCT138ADR2G

Overview

• Category: Integrated Circuit
• Use: Decoder/Demultiplexer
• Characteristics: High-Speed CMOS Logic, 3-to-8 Line Decoder
• Package: SOIC-16
• Essence: Decodes a three-bit binary input to one of eight outputs
• Packaging/Quantity: Tape and Reel, 2500 units per reel

Specifications

• Supply Voltage Range: 4.5V to 5.5V
• Input Voltage Range: 0V to VCC
• Output Voltage Range: 0V to VCC
• Maximum Operating Frequency: 25 MHz
• Propagation Delay Time: 15 ns (typical)
• Low Power Consumption: 20µA (max)

Pin Configuration

The MC74HCT138ADR2G has a total of 16 pins. The pin configuration is as follows:

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

Functional Features

The MC74HCT138ADR2G is a high-speed CMOS logic decoder/demultiplexer. It decodes a three-bit binary input to one of eight outputs. The enable inputs (E1 and E2) control the operation of the decoder. When both enable inputs are high, the outputs are in a high-impedance state.

Advantages and Disadvantages

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

Disadvantages: - Limited to 3-to-8 line decoding functionality - Not suitable for applications requiring higher decoding capabilities

Working Principles

The MC74HCT138ADR2G works by accepting a three-bit binary input (A2, A1, A0) and decoding it to one of eight possible outputs (Y0-Y7). The enable inputs (E1 and E2) control the operation of the decoder. When both enable inputs are high, the outputs are disabled and in a high-impedance state.

Detailed Application Field Plans

The MC74HCT138ADR2G 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 systems to decode address lines.
2. Data Routing: Enables selection of specific data paths in multiplexed systems.
3. LED Matrix Control: Used to drive LED matrices by selecting specific rows/columns.
4. Digital Displays: Decodes binary inputs to control seven-segment displays.
5. Programmable Logic Devices: Used as a part of complex programmable logic devices (CPLDs) and field-programmable gate arrays (FPGAs).

Alternative Models

1. SN74LS138N: Similar 3-to-8 line decoder with TTL logic levels.
2. CD74HC238E: 3-to-8 line decoder with CMOS logic levels.
3. 74HC138D: 3-to-8 line decoder with standard CMOS logic.

These alternative models provide similar functionality and can be used as substitutes for the MC74HCT138ADR2G in various applications.

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