SN74LS138DR

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SN74LS138DR

IC DECODER/DEMUX 1X3:8 16SOIC

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Specifications

Package Tape & Reel (TR),Cut Tape (CT)
Series 74LS
ProductStatus Active
Type Decoder/Demultiplexer
Circuit 1 x 3:8
IndependentCircuits 1
Current-OutputHighLow 400µA, 8mA
VoltageSupplySource Single Supply
Voltage-Supply 4.75V ~ 5.25V
OperatingTemperature 0°C ~ 70°C
MountingType Surface Mount
Package/Case 16-SOIC (0.154, 3.90mm Width)

Overview

Description

The SN74LS138DR is a 3-to-8 line decoder/demultiplexer integrated circuit from Texas Instruments. It takes three binary inputs (A0, A1, A2) and decodes them into one of eight active low outputs (Y0 to Y7). The device also features enable inputs (G1, G2A, G2B) that allow for control over the operation, ensuring low power consumption when disabled.
This IC is commonly used in data routing, memory addressing, and signal demultiplexing applications. It operates within a wide voltage range (typically 4.75V to 5.25V) and has fast propagation delays, making it suitable for high-speed digital circuits. The LS (Low Power Schottky) technology allows for lower power operation compared to standard TTL devices.
In summary, the SN74LS138DR is a versatile component ideal for creating complex digital systems by expanding the number of outputs from a limited number of inputs.

Features

The SN74LS138DR is a high-speed, low-power 3-to-8 line decoder/demultiplexer. Key features include:
1. Decoding Capability: It decodes 3 binary inputs (A0, A1, A2) into one of eight active low outputs (Y0 to Y7).
2. Enable Inputs: Features three enable inputs (G1, G2A, G2B) for enabling the device, allowing flexibility in operation.
3. Low Power Consumption: Designed with low power consumption typical of LS (Low Power Schottky) logic families.
4. Fast Switching: Offers fast propagation delay, typically around 11 ns, making it suitable for high-speed applications.
5. Wide Voltage Range: Operates over a supply voltage range of 4.75V to 5.25V.
6. Temperature Range: Suitable for standard operation from 0°C to 70°C.
7. TTL Compatible: Compatible with TTL logic levels, facilitating integration with other TTL devices.
8. Pin Configuration: Comes in a 16-pin DIP package (DR) for easy mounting and integration into circuits.
These features make the SN74LS138DR ideal for applications in data routing and memory addressing.

Package

The SN74LS138DR is packaged in a SOIC (Small Outline Integrated Circuit) form factor, specifically a 16-pin package. The "DR" suffix indicates that it is a surface-mount device, suitable for automated assembly and compact circuit designs.

Pinout

The SN74LS138DR is a 3-to-8 line decoder/demultiplexer with a total of 16 pins. Its pin functions are as follows:
1. A0, A1, A2 (Pins 2, 1, 0): Input lines used for selecting one of the eight outputs.
2. G1 (Pin 3): Active high enable input.
3. G2A (Pin 4): Active low enable input.
4. G2B (Pin 5): Active low enable input.
5. Y0 to Y7 (Pins 6, 7, 8, 9, 11, 12, 13, 14): Output lines; one of these outputs will be activated low based on the input combination.
6. GND (Pin 10): Ground connection.
7. VCC (Pin 15): Power supply connection (typically +5V).
8. NC (Pin 16): Not connected.
The device is commonly used in applications where binary to decimal decoding is required, allowing for expanded address decoding in memory applications or data routing.

Manufacturer

The SN74LS138DR is manufactured by Texas Instruments (TI), a multinational electronics company based in the United States. Founded in 1930, Texas Instruments specializes in designing and producing semiconductors and various integrated circuits (ICs) used in a wide range of electronic applications. The company is particularly known for its analog and embedded processing products, as well as digital signal processors (DSPs). TI serves diverse markets including automotive, industrial, communication, and consumer electronics, making it a key player in the global semiconductor industry. The SN74LS138DR is a part of TI's 74-series logic family, specifically a 3-line to 8-line decoder/demultiplexer, widely used in digital circuit design.

Application

The SN74LS138DR is a low-power, 3-to-8 line decoder/demultiplexer used in various applications, including data routing in digital circuits, memory address decoding, and control signal generation. It is commonly employed in logic circuits, microprocessor interfacing, and for expanding the number of outputs in systems. Its ability to drive multiple outputs makes it suitable for multiplexing applications and simplifying circuit designs in consumer electronics, telecommunications, and industrial automation.

Equivalent

The SN74LS138DR chip is a 3-to-8 line decoder/demultiplexer. Equivalent products include the 74HC138, 74HCT138, and 74LS138 (in different packages). Other alternatives are the 74F138 and the 74AC138, which offer similar functionality with variations in speed and power consumption. Always check specifications for compatibility with your application.

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