The TC74HC238AF is a high-speed CMOS 3-to-8 Line Decoder/Demultiplexer manufactured by Toshiba Semiconductor and Storage. It is part of the TC74HC series, known for improved speed and noise immunity compared to standard CMOS logic. This device decodes a 3-bit binary address to one of eight output lines, effectively functioning as a demultiplexer when one of the enable inputs is used as a data input. Its low power consumption and TTL compatible inputs make it well-suited for a wide range of digital logic applications.

Applications

• Memory Addressing: Decodes memory addresses in microprocessor systems.
• Data Routing: Routes data to specific output lines based on input address.
• Output Enable Circuits: Enables specific outputs based on input address.
• Peripheral Selection: Selects specific peripherals in a system.
• Control Signal Generation: Generates control signals based on input address.

Features

• High-Speed Operation: Offers faster decoding and demultiplexing speeds compared to standard CMOS.
• Low Power Consumption: Reduces the overall system power requirements.
• TTL Compatible Inputs: Interfaces easily with TTL logic levels.
• Wide Operating Voltage Range: Operates reliably across a broad voltage range.
• High Noise Immunity: Offers enhanced resistance to noise interference.
• 3-to-8 Line Decoding: Decodes a 3-bit address to activate one of eight output lines.

Benefits

• Improved System Performance: High-speed operation minimizes delays in digital circuits.
• Reduced Power Consumption: Low power consumption contributes to energy efficiency.
• Simplified System Interfacing: TTL compatible inputs simplify integration with other logic families.
• Reliable Operation: High noise immunity ensures stable performance in noisy environments.
• Versatile Application: Suitable for diverse decoding and demultiplexing tasks.

Additional Details

The TC74HC238AF is typically supplied in a surface-mount package (SOIC). It operates from a supply voltage of 2V to 6V. The standard operating temperature range is typically -40°C to +85°C. The device features three enable inputs, allowing for flexible control over the decoding/demultiplexing operation. All outputs are active low. The inputs are protected against electrostatic discharge.