74HC138D

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74HC138D

IC DECODER 1 X 3:8 16SOIC

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Specifications

Package Tape & Reel (TR),Cut Tape (CT)
Series 74HC
ProductStatus Active
Type Decoder/Demultiplexer
Circuit 1 x 3:8
IndependentCircuits 1
Current-OutputHighLow 5.2mA, 5.2mA
VoltageSupplySource Single Supply
Voltage-Supply 2V ~ 6V
OperatingTemperature -40°C ~ 125°C
MountingType Surface Mount
Package/Case 16-SOIC (0.154, 3.90mm Width)

Overview

Description

The 74HC138D is a high-speed CMOS 3-to-8 line decoder/demultiplexer, designed to convert binary inputs into a corresponding active low output. It features three binary select inputs (A0, A1, A2) and eight outputs (Y0 to Y7). When a specific combination of inputs is activated, one of the outputs goes low, while all others remain high.
Key features include:
- Wide voltage range: Operates typically from 2V to 6V.
- Low power consumption: Ideal for battery-operated devices.
- Fast propagation delay: Offers quick response times, making it suitable for high-speed applications.
- Enable inputs: The device can be controlled with enable signals, allowing for further design flexibility.
The 74HC138D is commonly used in applications like memory address decoding, data routing, and circuit multiplexing, making it an essential component in digital electronics and microcontroller projects. Its compact design and efficiency provide a robust solution for complex logic tasks in various electronic systems.

Features

The 74HC138D is a high-speed CMOS 3 to 8 line decoder/demultiplexer. Key features include:
1. Inputs and Outputs: It has three binary select inputs (A0, A1, A2) that can decode to one of eight outputs (Y0 to Y7), with one output activated low.
2. Enable Pins: It features three enable inputs (G1, G2A, G2B) to control the device operation, allowing it to be disabled for power saving.
3. Wide Voltage Range: Operates from a supply voltage of 2V to 6V, making it compatible with various logic families.
4. High Speed: Capable of switching speeds up to 6 ns at a 5V supply, suitable for high-frequency applications.
5. Low Power Consumption: Consumes low static and dynamic power, making it energy-efficient.
6. Output Current: Each output can drive up to 20 mA, supporting various load types.
7. TTL Compatible: The device is compatible with TTL logic levels, facilitating integration in mixed logic environments.
These features make the 74HC138D ideal for applications in digital circuits where address decoding is required.

Package

The 74HC138D is typically packaged in a 16-pin dual in-line package (DIP) format. It can also be found in other package types like SOIC or TSSOP, depending on the manufacturer.

Pinout

The 74HC138D is a 3-to-8 line decoder/demultiplexer integrated circuit with 16 pins. Its functions include decoding a 3-bit binary input into one of eight active low outputs and enabling specific functions based on the enable inputs.
Pin Count and Functions:
1. Pin 1: A0 - Input for the least significant bit.
2. Pin 2: A1 - Input for the middle bit.
3. Pin 3: A2 - Input for the most significant bit.
4. Pin 4: GND - Ground.
5. Pin 5: E1 - Enable input (active high).
6. Pin 6: E2 - Enable input (active high).
7. Pin 7: E3 - Enable input (active low).
8. Pins 8-15: Y0 to Y7 - Outputs (active low).
9. Pin 16: Vcc - Power supply.
When the enable inputs are correctly activated, the selected output (Y0 to Y7) goes low corresponding to the binary value of the inputs (A0, A1, A2). All other outputs remain high.

Manufacturer

The 74HC138D is a product manufactured by various semiconductor companies, with Texas Instruments (TI) being one of the most prominent manufacturers of this device. Texas Instruments is a global technology company that designs and manufactures semiconductors and various integrated circuits. It is well-known for its analog and embedded processing products, serving a wide range of industries, including automotive, industrial, personal electronics, and communications. The 74HC138D is a high-speed CMOS decoder/demultiplexer used in digital circuits for address decoding and data routing applications. TI and other manufacturers provide this IC in various package types to meet different design requirements.

Application

The 74HC138D is a 3-to-8 line decoder/demultiplexer used in various applications such as memory address decoding, data routing, and digital signal processing. It can also be employed in microprocessor interfacing, logic circuit design, and multiplexing to select and activate specific output lines based on the input combination. Additionally, it is useful in LED control, display multiplexing, and as a building block for complex digital systems.

Equivalent

The 74HC138D is a 3-to-8 line decoder/demultiplexer. Equivalent products include the 74HCT138 (TTL compatible), 74AC138, 74ALVC138, and 74LV138. Additionally, other families like 74LS138 and 74F138 can be considered, though they may have different speed and voltage characteristics. Always check specifications for compatibility in your application.

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