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74HCT138PW

Name: 74HCT138PW
Rating: 4.7 (12 reviews)

Encoders, Decoders, Multiplexers & Demultiplexers 3-TO-8 DECODER DEMULTIPLEXER

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概述

Description

The 74HCT138PW is a high-speed, CMOS 3-to-8 line decoder/demultiplexer. It converts a 3-bit binary input into one of eight active low outputs, allowing for the selection of one of eight different devices or data lines based on the input combination. The device operates with a supply voltage range of 2V to 6V, making it compatible with various logic levels, particularly TTL.
Key features include:
- Inputs: Three address inputs (A0, A1, A2) for selecting outputs.
- Outputs: Eight active low outputs (Y0 to Y7).
- Enable inputs: Three enable lines (G1, G2A, G2B) that control the activation of the device.
- Speed: Fast operation, suitable for high-frequency applications.
- Low Power: CMOS technology ensures low power consumption.
The 74HCT138PW is widely used in applications such as memory addressing, data routing, and digital signal processing, where signal selection and data demultiplexing are required.

Features

The 74HCT138PW is a high-speed CMOS 3-to-8 line decoder/demultiplexer. Key features include:
1. Logic Levels: Compatible with TTL levels, making it suitable for interfacing with TTL devices.
2. Inputs and Outputs: It has 3 binary inputs (A0, A1, A2) for selection and 8 active-low outputs (Y0 to Y7).
3. Enable Inputs: Two active-low enable pins (G1, G2A) and one active-high enable pin (G2B) for control.
4. Low Power Consumption: Operates with low power, typically around 1 μA, enhancing efficiency in designs.
5. High Speed: Capable of operating at high speeds, typically around 8 ns propagation delay, ensuring quick signal processing.
6. Temperature Range: Designed to function in a wide temperature range, from -40°C to +125°C.
7. Package Options: Available in various packages, including DIP and TSSOP for flexibility in design.
This makes the 74HCT138PW ideal for applications in digital logic systems, memory address decoding, and data routing.

Package

The 74HCT138PW is packaged in a TSSOP (Thin Shrink Small Outline Package) with 16 pins. This compact package type is designed for surface mount applications, providing a low-profile solution for integrating the chip onto PCBs.

Pinout

The 74HCT138PW 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
2. A1 (Pin 2) - Input
3. A2 (Pin 3) - Input
4. G1 (Pin 4) - Active HIGH enable input
5. G2A (Pin 5) - Active LOW enable input
6. G2B (Pin 6) - Active LOW enable input
7. Y0 (Pin 7) - Output
8. Y1 (Pin 8) - Output
9. Y2 (Pin 9) - Output
10. Y3 (Pin 10) - Output
11. Y4 (Pin 11) - Output
12. Y5 (Pin 12) - Output
13. Y6 (Pin 13) - Output
14. Y7 (Pin 14) - Output
15. NC (Pin 15) - No Connect
16. VCC (Pin 16) - Power supply
The device decodes the three binary inputs (A0, A1, A2) into one of eight outputs (Y0 to Y7) when the enable conditions (G1=HIGH, G2A=LOW, G2B=LOW) are met.

Manufacturer

The 74HCT138PW is manufactured by Nexperia, a global semiconductor company. Nexperia specializes in producing discrete, logic, and MOSFET components, as well as analog and mixed-signal devices. The company focuses on high-volume manufacturing and serves a variety of markets, including automotive, industrial, and consumer electronics. Nexperia originated from the former semiconductor division of Philips and has established itself as a key player in the semiconductor industry, offering reliable and efficient products for diverse applications.

Application

The 74HCT138PW is a 3-to-8 line decoder/demultiplexer used in various applications, including memory address decoding, data routing, and signal demultiplexing in digital circuits. It facilitates the selection of one out of eight outputs based on three input lines, making it ideal for multiplexing tasks in microprocessor interfacing, communication systems, and programmable logic devices. Additionally, it finds use in LED control and digital logic design for simplifying circuit complexity.

Equivalent

The 74HCT138PW is a high-speed CMOS decoder/demultiplexer. Equivalent products include:
- 74HC138
- 74LS138
- 74AHC138
- 74AHCT138
- CD74HC138
These devices may differ in power consumption, speed, and logic family but serve the same functional purpose. Always check datasheets for specific electrical characteristics and pin configurations.