SN74HC138 3-to-8 Line Decoder ?C DIP-16 Logic IC | Texas Instruments

Texas Instruments SN74HC138 ?C High-Speed CMOS 3-to-8 Decoder for Digital Systems

The SN74HC138 from Texas Instruments is a high-performance CMOS 3-to-8 line decoder/demultiplexer designed for digital logic systems that require precise signal routing and address decoding. This IC is ideal for applications involving memory address decoding, signal demultiplexing, and device selection.

With three binary inputs and three enable lines (two active-low, one active-high), the device can activate one of eight outputs based on the binary code presented. Outputs are active low, and only one is low at a time, making this IC ideal for one-of-many logic applications. As a trusted source, IC Manufacturer supports its use in high-reliability industrial and embedded electronics.

Electrical Specifications and Pin Configuration

Key Features and Functional Advantages

• Address Decoding: Enables unique selection of one line out of eight with fast response time, useful in microprocessor systems.
• Enable Logic Control: Cascadable enable inputs simplify system expansion without external logic components.
• Noise Immunity: CMOS technology offers better protection against false triggering in electrically noisy environments.
• Wide Supply Range: Compatible with 2V to 6V systems, making it versatile for both 3.3V and 5V designs.

Typical Applications

• Memory Address Selection in Microcontrollers
• Peripheral Selection in Embedded Systems
• Logic Routing in Programmable Control Boards
• Digital Signal Multiplexing and Demultiplexing

Frequently Asked Questions (FAQ)

What does the SN74HC138 decoder do?

This device selects one of eight outputs based on a 3-bit binary input and active enable signals. It’s typically used for address decoding or signal routing in digital systems.

How many enable inputs does it have?

The SN74HC138 features three enable inputs??two active-low and one active-high??which allows for flexible enable/disable logic and easy cascading of multiple units.

Is it suitable for 3.3V and 5V systems?

Yes. With a wide supply voltage range from 2V to 6V, this IC is compatible with both 3.3V and 5V logic levels, ensuring broad usability across platforms.

Can this device be used in industrial settings?

Absolutely. Its CMOS construction, noise immunity, and wide temperature and voltage tolerance make it well-suited for demanding industrial and embedded applications.

What packaging is available?

The SN74HC138 is typically available in DIP-16 through-hole packages, facilitating easy integration into both development and production circuits.