SN74AHC138NSR

Product Overview

Category: Integrated Circuit
Use: Decoder/Demultiplexer
Characteristics:
- High-speed CMOS technology
- Low power consumption
- Wide operating voltage range
- Multiple output enable inputs
Package: SOIC (Small Outline Integrated Circuit)
Essence: Decodes binary information to control multiple outputs
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
Maximum Propagation Delay: 11 ns
Maximum Quiescent Current: 4 μA

Pin Configuration

The SN74AHC138NSR has a total of 16 pins:

GND (Ground)
A0 (Address Input 0)
A1 (Address Input 1)
A2 (Address Input 2)
E1 (Enable Input 1)
E2 (Enable Input 2)
E3 (Enable Input 3)
Y0 (Output 0)
Y1 (Output 1)
Y2 (Output 2)
Y3 (Output 3)
Y4 (Output 4)
Y5 (Output 5)
Y6 (Output 6)
Y7 (Output 7)
VCC (Supply Voltage)

Functional Features

Decodes a 3-bit binary input to one of eight outputs
Multiple output enable inputs for flexible control
High-speed operation allows for real-time decoding
Low power consumption makes it suitable for battery-powered devices
Wide operating voltage range ensures compatibility with various systems

Advantages and Disadvantages

Advantages: - High-speed CMOS technology enables fast decoding - Low power consumption prolongs battery life - Multiple output enable inputs provide flexibility in controlling outputs

Disadvantages: - Limited to 3-bit binary input decoding - Propagation delay of 11 ns may not be suitable for extremely time-critical applications

Working Principles

The SN74AHC138NSR is a decoder/demultiplexer integrated circuit that takes a 3-bit binary input and decodes it to one of eight possible outputs. The input address lines (A0, A1, A2) determine which output line (Y0-Y7) will be active. The enable inputs (E1, E2, E3) control the overall operation of the decoder.

When the enable inputs are active, the decoder decodes the binary input and activates the corresponding output line. The selected output line goes high, while all other output lines remain low. This allows the user to control multiple outputs based on the input address.

Detailed Application Field Plans

The SN74AHC138NSR can be used in various applications, including:

Address decoding in microcontrollers and microprocessors
Memory selection in RAM and ROM systems
Data routing in multiplexers and demultiplexers
Signal decoding in communication systems
Control logic in digital circuits

Detailed and Complete Alternative Models

CD74HC138E: Similar decoder/demultiplexer IC from Texas Instruments
MC74HC138N: Decoder/demultiplexer IC from ON Semiconductor
74HCT138: High-speed CMOS decoder/demultiplexer from NXP Semiconductors

These alternative models offer similar functionality and can be used as substitutes for the SN74AHC138NSR in various applications.

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Noem 10 veelgestelde vragen en antwoorden met betrekking tot de toepassing van SN74AHC138NSR in technische oplossingen

Sure! Here are 10 common questions and answers related to the application of SN74AHC138NSR in technical solutions:

Question: What is SN74AHC138NSR?
Answer: SN74AHC138NSR is a 3-to-8 line decoder/demultiplexer IC (integrated circuit) that can be used in various digital logic applications.
Question: What is the purpose of SN74AHC138NSR?
Answer: The purpose of SN74AHC138NSR is to decode binary information from input lines and activate one of the eight output lines based on the input combination.
Question: What voltage levels does SN74AHC138NSR support?
Answer: SN74AHC138NSR supports voltage levels ranging from 2V to 5.5V, making it compatible with both TTL (Transistor-Transistor Logic) and CMOS (Complementary Metal-Oxide-Semiconductor) logic families.
Question: How many input lines does SN74AHC138NSR have?
Answer: SN74AHC138NSR has three input lines (A0, A1, and A2) that can accept binary inputs to select one of the eight output lines.
Question: Can SN74AHC138NSR be cascaded to increase the number of output lines?
Answer: Yes, multiple SN74AHC138NSR ICs can be cascaded together to increase the number of output lines by connecting the enable (E) pin of the subsequent IC to the output of the previous IC.
Question: What is the maximum output current of SN74AHC138NSR?
Answer: The maximum output current of SN74AHC138NSR is typically 8mA, which makes it suitable for driving standard logic gates and other digital components.
Question: Can SN74AHC138NSR be used as a demultiplexer?
Answer: Yes, SN74AHC138NSR can be used as a demultiplexer by connecting the input lines to the select lines and using the output lines as separate outputs for different signals.
Question: What is the propagation delay of SN74AHC138NSR?
Answer: The propagation delay of SN74AHC138NSR is typically around 5ns, which means there is a slight delay between the input change and the corresponding output change.
Question: Is SN74AHC138NSR suitable for high-speed applications?
Answer: Yes, SN74AHC138NSR is designed for high-speed operation and can be used in applications where fast decoding or demultiplexing is required.
Question: Are there any specific precautions to consider when using SN74AHC138NSR?
Answer: It is important to ensure that the power supply voltage does not exceed the specified range (2V to 5.5V) and to avoid exceeding the maximum ratings for input and output currents to prevent damage to the IC. Additionally, proper decoupling capacitors should be used to minimize noise and ensure stable operation.