SN54LS138J

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SN54LS138J

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3-LINE TO 8-LINE DECODERS/DEMULT

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仕様

属性 値
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

概要

Description

The SN54LS138J is a high-performance 3-to-8 line decoder/demultiplexer integrated circuit. It is part of the 54LS/74LS series, designed for use in military and industrial applications due to its extended temperature range. The device takes three binary inputs (A0, A1, A2) and decodes them into one of eight mutually exclusive outputs. It features three enable inputs (E1, E2, and E3), which allow for the expansion of the device to a 1-of-32 (or more) decoder by cascading multiple units. The outputs are active-low, meaning they will go low when the corresponding input combination is selected.
The SN54LS138J offers high performance with fast switching speeds and low power consumption due to its TTL (Transistor-Transistor Logic) construction. It is housed in a J-lead ceramic dual in-line package, providing robust mechanical performance. This decoder is commonly used in applications requiring data routing, memory addressing, and as a demultiplexer for digital signal processing. Its reliability and versatility make it a staple in designing complex digital systems.

Equivalent

The SN54LS138J is a 3-to-8 line decoder/demultiplexer. Equivalent products include the SN74LS138, 74HC138, 74HCT138, and CD74HCT138. These equivalents provide similar functionality with variations in voltage levels, speed, and power consumption, so be sure to check their datasheets for compatibility with your specific application.

Features

The SN54LS138J is a high-performance 3-to-8 line decoder/demultiplexer. Key features include:
1. 3-to-8 Line Decoder: Converts 3 binary inputs into 8 unique outputs.
2. Active Low Outputs: Outputs are active low, meaning they go low when selected.
3. Enable Inputs: Equipped with three enable inputs (two active low, one active high), allowing for easy cascading and expansion.
4. High-Speed Operation: Offers fast response times due to TTL technology.
5. Low Power Consumption: Designed for efficient power usage.
6. Wide Application Range: Suitable for memory address decoding, data routing, and demultiplexing applications.
7. Military-grade: SN54 series is designed to meet military specifications, offering better temperature and reliability metrics.
8. Package Type: Available in ceramic DIP packages, ensuring durability.
These features make the SN54LS138J suitable for a variety of digital applications where decoding or signal routing is required.

Pinout

The SN54LS138J is a 3-to-8 line decoder/demultiplexer with active-low outputs. It has a total of 16 pins. The main functions of this integrated circuit include decoding three binary weighted address inputs (A, B, C) into one of eight mutually exclusive outputs (Y0 to Y7), each of which is active-low.
Here is a brief outline of its pin configuration:
1. Inputs:
- A (Pin 1)
- B (Pin 2)
- C (Pin 3)
2. Enable Inputs:
- G1 (Pin 6) - Active-high enable
- G2A' (Pin 4) - Active-low enable
- G2B' (Pin 5) - Active-low enable
3. Outputs (Active-Low):
- Y0' (Pin 15)
- Y1' (Pin 14)
- Y2' (Pin 13)
- Y3' (Pin 12)
- Y4' (Pin 11)
- Y5' (Pin 10)
- Y6' (Pin 9)
- Y7' (Pin 7)
4. Power Supply:
- VCC (Pin 16) - Power supply
- GND (Pin 8) - Ground
This IC is used in applications that require selecting one line out of several based on binary input values, such as in memory address decoding.

Manufacturer

The SN54LS138J is a product manufactured by Texas Instruments (TI). Texas Instruments is a global semiconductor design and manufacturing company that develops analog and embedded processing chips. Founded in 1930 and headquartered in Dallas, Texas, the company is one of the largest and most well-known semiconductor companies in the world. TI's products are used in a wide range of applications, including industrial, automotive, personal electronics, communications equipment, and enterprise systems. The SN54LS138J is a specific part of their logic devices lineup, commonly used in digital circuits for decoding purposes.

Application

The SN54LS138J is a 3-to-8 line decoder/demultiplexer commonly used in digital circuits. Its application areas include memory address decoding in microprocessor systems, where it helps select specific memory locations. It is also used in data routing, allowing a single data source to be directed to one of several destinations. Additionally, it is applied in implementing logic functions, expanding I/O ports in microcontrollers, and activating specific components in response to particular binary inputs. Its ability to decode binary inputs into a one-of-eight output makes it versatile for various control and signal routing tasks in digital electronics.

Package

The SN54LS138J is a 3-to-8 line decoder/demultiplexer. The "J" in its designation typically refers to a ceramic dual in-line package (DIP), which is used for military and aerospace applications due to its robust build and ability to operate in more extreme conditions compared to standard plastic packages.

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