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SN74LS138N

Name: SN74LS138N
Rating: 4.7 (12 reviews)

IC DECODER/DEMUX 1 X 3:8 16-PDIP

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Mfr。パート #SN74LS138N
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データシート SN74LS138N DataSheet
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仕様

Series	74LS
Part Status	Active
Base Product Number	74LS138
Type	Decoder/Demultiplexer
Circuit	1 x 3:8
Independent Circuits	1
Current - Output High, Low	400µA, 8mA
Voltage Supply Source	Single Supply
Voltage - Supply	4.75V ~ 5.25V
Operating Temperature	0°C ~ 70°C
Mounting Type	Through Hole
Package	16-DIP (0.300", 7.62mm)
Supplier Device Package	16-PDIP
Packaging	Tube

概要

Description

The SN74LS138N is a high-speed, low-power 3-to-8 line decoder/demultiplexer from Texas Instruments, part of the 74LS (Low Power Schottky) series. It has three input lines (A0, A1, A2) and eight output lines (Y0 to Y7). The device activates one of the eight outputs based on the binary value of the inputs, while all other outputs remain inactive.
Key features include a wide operating voltage range (4.75V to 5.25V), fast propagation delay (typically 10ns), and low power consumption, making it suitable for various digital applications. It also includes enable inputs (G1, G2A, G2B) that allow for control over the output activation, enabling cascading of multiple decoders for larger decoding scenarios.
The SN74LS138N is commonly used in memory address decoding, data routing, and various logic circuits, providing efficient and reliable performance in electronic designs. Its TTL compatibility ensures ease of integration with other digital logic devices.

Features

The SN74LS138N is a triple 3-to-8 line decoder/demultiplexer with the following key features:
1. Inputs and Outputs: It has three binary select inputs (A0, A1, A2) and eight active-low outputs (Y0 to Y7).
2. Enable Inputs: Two active-low enable inputs (G1, G2A, G2B) control the decoder’s operation, allowing for cascading and flexibility in design.
3. Low Power Consumption: Part of the low-power TTL family, it operates with reduced power requirements.
4. High Speed: Typical propagation delay is around 10 ns, making it suitable for high-speed applications.
5. Fan-out Capability: Each output can drive up to 10 standard TTL loads, facilitating multiple connections.
6. Wide Operating Voltage Range: Compatible with a 4.75V to 5.25V supply voltage range.
7. Temperature Range: Designed for industrial applications, it operates across a standard temperature range.
This device is commonly used in memory decoding, data routing, and as a demultiplexer in digital circuit applications.

Package

The SN74LS138N is typically available in a 16-pin dual in-line package (DIP) format. It can also be found in surface-mount configurations like SOIC. The "N" suffix indicates the plastic DIP type.

Pinout

The SN74LS138N is a 3-to-8 line decoder/demultiplexer with a total of 16 pins. Its pin configuration and functions are as follows:
1. A0 (Pin 1) - Input 0
2. A1 (Pin 2) - Input 1
3. A2 (Pin 3) - Input 2
4. G1 (Pin 4) - Enable input (active high)
5. G2A (Pin 5) - Enable input (active low)
6. G2B (Pin 6) - Enable input (active low)
7. Y0 (Pin 7) - Output 0 (active low)
8. Y1 (Pin 8) - Output 1 (active low)
9. Y2 (Pin 9) - Output 2 (active low)
10. Y3 (Pin 10) - Output 3 (active low)
11. Y4 (Pin 11) - Output 4 (active low)
12. Y5 (Pin 12) - Output 5 (active low)
13. Y6 (Pin 13) - Output 6 (active low)
14. Y7 (Pin 14) - Output 7 (active low)
15. VCC (Pin 15) - Power supply (typically +5V)
16. GND (Pin 16) - Ground
The device decodes the binary inputs (A0, A1, A2) into a corresponding active low output (Y0 to Y7) when enabled.

Manufacturer

The SN74LS138N is manufactured by Texas Instruments (TI), a prominent American technology company. Founded in 1930, Texas Instruments specializes in the design and production of semiconductors and various integrated circuits, which are essential for electronics in a wide range of applications, including consumer electronics, automotive, industrial, and communications. TI is well-known for its innovation in analog and digital signal processing technologies and is a leader in the semiconductor industry, providing solutions that enhance the performance and efficiency of electronic devices.

Application

The SN74LS138N is a high-speed, low-power 3-to-8 line decoder/demultiplexer. Its application areas include digital circuit design for data routing, memory address decoding, and control signal demultiplexing in microprocessor systems. It is commonly used in communication systems, multiplexing applications, and as a component in various logic circuits to enable or disable specific outputs based on binary inputs.

Equivalent

The SN74LS138N is a 3-to-8 line decoder/demultiplexer. Equivalent products include:
1. 74HC138
2. 74HCT138
3. MC14538
4. 74LS138
5. CD74HC138
These alternatives may vary in logic level compatibility, speed, and power consumption. Always check the specific datasheet for detailed electrical characteristics.