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74HC138PW

Name: 74HC138PW
Rating: 4.7 (12 reviews)

Encoders, Decoders, Multiplexers & Demultiplexers 3-OF-8 DECODER/DEMUX

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Mfr。パート #74HC138PW
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データシート 74HC138PW DataSheet
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仕様

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概要

Description

The 74HC138PW is a high-speed CMOS decoders/demultiplexers that can be used in various digital applications. It features a 3-to-8 line decoder function, meaning it takes three binary inputs and activates one of eight outputs based on the input combination. The device also includes enable inputs, allowing for control over the output states, which helps in minimizing power consumption and enhancing system design flexibility.
Key characteristics include wide operating voltage ranges (2V to 6V), low power consumption, and fast switching speeds. The 74HC138 is designed for use in logic level applications, such as data routing, memory address decoding, and digital signal processing. It is available in various packages, including DIP and TSSOP, making it suitable for different circuit board layouts.
Overall, the 74HC138PW is a reliable and versatile component for implementers of digital systems requiring efficient address decoding.

Features

The 74HC138PW is a 3-to-8 line decoder/demultiplexer featuring:
1. Input Lines: It has 3 binary select inputs (A0, A1, A2) that allow for decoding into one of eight outputs.
2. Output Lines: Eight active low outputs (Y0 to Y7), where only the selected output goes low based on the input combination.
3. Enable Inputs: Two enable inputs (E1, E2) and one enable input (E3) that must be active for the device to operate. If any enable input is inactive, all outputs remain high.
4. High Speed: Operates at high speeds with a typical propagation delay of around 4.5 ns at Vcc = 5V.
5. Wide Operating Voltage: Compatible with a supply voltage range of 2V to 6V.
6. Low Power Consumption: Low static power consumption, making it suitable for battery-operated devices.
7. TTL Compatibility: Compatible with TTL logic levels, ensuring it can interface with other TTL devices.
The 74HC138PW is commonly used in memory address decoding and data routing applications.

Package

The 74HC138PW is packaged in a TSSOP (Thin Shrink Small Outline Package) form factor. It typically has 16 pins and is designed for surface mount applications.

Pinout

The 74HC138PW is a 3-to-8 line decoder/demultiplexer, and it has a total of 16 pins. Its pin configuration is as follows:
1. A0 (Pin 1): Input A0
2. A1 (Pin 2): Input A1
3. A2 (Pin 3): Input A2
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 Y0
8. Y1 (Pin 8): Output Y1
9. Y2 (Pin 9): Output Y2
10. Y3 (Pin 10): Output Y3
11. Y4 (Pin 11): Output Y4
12. Y5 (Pin 12): Output Y5
13. Y6 (Pin 13): Output Y6
14. Y7 (Pin 14): Output Y7
15. VCC (Pin 15): Power supply
16. GND (Pin 16): Ground
The device decodes the 3 binary inputs (A0, A1, A2) into one of the eight outputs (Y0 to Y7), which is activated based on the input combination, provided the enable inputs (G1, G2A, G2B) are correctly set.

Manufacturer

The 74HC138PW is manufactured by Texas Instruments (TI), a global semiconductor company headquartered in Dallas, Texas. Texas Instruments designs and produces a wide range of electronic components, including analog and digital semiconductors, embedded processors, and microcontrollers. The company is renowned for its innovations in signal processing and analog technologies, serving various industries such as automotive, industrial, communications, and consumer electronics. TI is a key player in the semiconductor market, focusing on developing high-performance integrated circuits and systems for diverse applications.

Application

The 74HC138PW is a 3-to-8 line decoder/demultiplexer used in various applications, including memory address decoding, data routing, and circuit control. It can enable specific devices or memory chips based on input binary values. Common uses include selecting peripherals in microcontroller systems, implementing multiplexers in communication circuits, and organizing data flow in digital systems. Its fast switching speeds and low power consumption make it suitable for high-speed applications in consumer electronics, automotive systems, and industrial automation.

Equivalent

The 74HC138PW is a 3-to-8 line decoder/demultiplexer. Equivalent products include:
1. 74HCT138 - TTL compatible version.
2. 74LS138 - Low power Schottky version.
3. 74AC138 - CMOS version for faster operation.
4. 74ACT138 - TTL compatible with higher speed.
5. 74HC154 - 4-to-16 line decoder/demultiplexer.
Ensure compatibility with your application regarding voltage levels and speed requirements.