SN74AHCT138DBR

Product Overview

• Category: Integrated Circuit (IC)
• Use: Decoder/Demultiplexer
• Characteristics: High-speed, low-power, 3-to-8 line decoder/demultiplexer
• Package: SSOP-16
• Essence: Converts a binary input into a corresponding output based on the selected line
• Packaging/Quantity: Tape and Reel, 2500 units per reel

Specifications

• Supply Voltage Range: 2V to 5.5V
• Input Voltage Range: 0V to VCC
• Output Voltage Range: 0V to VCC
• Operating Temperature Range: -40°C to +85°C
• Propagation Delay Time: 6 ns (typical)
• Output Current: ±8 mA
• Power Dissipation: 500 mW (max)

Detailed Pin Configuration

The SN74AHCT138DBR has a total of 16 pins, which are assigned as follows:

1. GND: Ground
2. A0: Binary input line A0
3. A1: Binary input line A1
4. A2: Binary input line A2
5. /G1: Active-low enable input
6. Y0: Output line Y0
7. Y1: Output line Y1
8. Y2: Output line Y2
9. Y3: Output line Y3
10. Y4: Output line Y4
11. Y5: Output line Y5
12. Y6: Output line Y6
13. Y7: Output line Y7
14. VCC: Positive power supply
15. /G2A: Active-low enable input
16. /G2B: Active-low enable input

Functional Features

• Converts a 3-bit binary input into one of the eight corresponding output lines
• Active-low enable inputs (/G1, /G2A, /G2B) control the operation of the decoder/demultiplexer
• High-speed operation allows for efficient data processing
• Low-power consumption makes it suitable for battery-powered devices

Advantages and Disadvantages

Advantages: - High-speed operation enables quick response time - Low-power consumption prolongs battery life - Compact SSOP-16 package saves board space - Wide supply voltage range allows for versatile applications

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

Working Principles

The SN74AHCT138DBR operates based on the principle of binary decoding. The three input lines (A0, A1, A2) represent a binary number, and the selected output line (Y0-Y7) corresponds to the decimal equivalent of the binary input. The active-low enable inputs (/G1, /G2A, /G2B) control the operation of the decoder/demultiplexer.

Detailed Application Field Plans

The SN74AHCT138DBR is commonly used in various digital systems where decoding or demultiplexing is required. Some specific application fields include:

1. Address Decoding: Used in microcontrollers and memory systems to select specific addresses.
2. Data Routing: Enables selection of specific data paths in multiplexed systems.
3. LED Matrix Control: Allows driving of individual LEDs in a matrix configuration.
4. Display Systems: Used to decode address signals for driving segment displays.
5. Communication Systems: Facilitates channel selection and routing in communication protocols.

Detailed and Complete Alternative Models

1. SN74LS138: Similar 3-to-8 line decoder/demultiplexer with TTL logic levels.
2. CD74HC138: 3-to-8 line decoder/demultiplexer with high-speed CMOS logic.
3. 74HC238: 3-to-8 line decoder/demultiplexer with active-high enable inputs.

These alternative models provide similar functionality and can be used as substitutes for the SN74AHCT138DBR in various applications.

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