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SN54LS138J

Name: SN54LS138J
Rating: 4.7 (12 reviews)

3-LINE TO 8-LINE DECODERS/DEMULT

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資料表 SN54LS138J DataSheet
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規格

Series	54LS
Part Status	Active
Type	Decoder/Demultiplexer
Circuit	1 x 3:8
Independent Circuits	1
Current - Output High, Low	400µA, 4mA
Voltage Supply Source	Single Supply
Voltage - Supply	4.5V ~ 5.5V
Operating Temperature	-55°C ~ 125°C
Mounting Type	Through Hole
Package / Case	16-CDIP (0.300", 7.62mm)
Supplier Device Package	16-CDIP

概述

Description

The SN54LS138J is a high-speed, low-power 3-to-8 line decoder/demultiplexer used in digital circuits. It takes three binary inputs (A2, A1, A0) and decodes them into one of eight active low outputs (Y0 to Y7). The device also features three enable inputs (G1, G2A, G2B) that control its operation; the outputs are only active when the enable conditions are met.
Key characteristics include:
- Logic Family: Part of the LS (Low Power Schottky) series, offering fast switching speeds and reduced power consumption.
- Voltage Range: Typically operates within 4.5V to 5.5V.
- Output Drive Capability: Can drive TTL loads, making it suitable for various applications.
- Applications: Commonly used in memory address decoding, data routing, and any application requiring multiple control lines from a limited number of inputs.
Overall, the SN54LS138J is a versatile component, ideal for simplifying circuit designs and expanding data paths in digital systems.

Features

The SN54LS138J is a high-speed, low-power 3-to-8 line decoder/demultiplexer. Key features include:
1. Decoding Capability: It decodes a 3-bit binary input into one of eight active low outputs.
2. Fast Operation: It operates with fast switching times, typically 11 ns, making it suitable for high-speed applications.
3. Low Power Consumption: Designed for low power operation, it has a maximum power dissipation of 1 W.
4. Enable Inputs: It includes three enable inputs (G1, G2A, G2B) that can be used to control the decoder's functionality, allowing flexibility in circuit design.
5. Active Low Outputs: The outputs are active low, which is ideal for interfacing with TTL logic.
6. Wide Operating Voltage: It supports a wide range of supply voltages, typically from 4.75V to 5.25V.
7. Temperature Range: As a military-grade device, it operates reliably over a wide temperature range.
The SN54LS138J is often used in memory address decoding, data routing, and multiplexing applications in digital circuits.

Package

The SN54LS138J is a 3-to-8 line decoder/demultiplexer packaged in a dual in-line package (DIP) format with 16 pins. The "J" designation indicates it is a ceramic package, suitable for military or high-reliability applications.

Pinout

The SN54LS138J is a 3-to-8 line decoder/demultiplexer with a total of 16 pins. Its pin configuration includes:
1. Inputs:
- A0, A1, A2 (pins 1, 2, 3) for selecting the output line.
- G1 (pin 4) is an active high enable input.
- G2A, G2B (pins 5, 6) are active low enable inputs.
2. Outputs:
- Y0 to Y7 (pins 7, 8, 9, 10, 11, 12, 13, 14) represent the decoded output lines. Only one of these outputs will be low (active) at any time based on the input combinations.
3. Additional Pins:
- VCC (pin 16) for power supply.
- GND (pin 8) for ground connection.
The device is commonly used in digital applications for address decoding and data routing.

Manufacturer

The SN54LS138J is manufactured by Texas Instruments (TI), a well-known company in the semiconductor industry. Texas Instruments specializes in designing and producing a wide range of integrated circuits, analog and digital signal processing devices, and various semiconductor products. Founded in 1930, TI is recognized for its innovations in electronics and plays a significant role in various markets, including automotive, industrial, consumer electronics, and communications. The SN54LS138J is a 3-to-8 line decoder/demultiplexer, commonly used in digital circuits to facilitate data routing and control logic functions. TI's extensive portfolio and commitment to research and development have positioned it as a leader in the electronic components sector.

Application

The SN54LS138J is a 3-to-8 line decoder/demultiplexer used in various applications, including memory address decoding, data routing, and signal demultiplexing. It is commonly employed in digital circuits for expanding the number of output lines from a limited number of inputs, enabling efficient data management in microprocessor and microcontroller systems, as well as in communication systems and control logic.

Equivalent

The SN54LS138J is a 3-to-8 line decoder/demultiplexer. Equivalent products include the SN740138, MC14538, and 74HC138. These alternatives maintain similar functionality and are used for similar applications in digital circuits. Always check the specific voltage and temperature ratings when considering replacements.