The NJU74HC238D is a 3-to-8 line decoder/demultiplexer manufactured by New Japan Radio (NJR). This device accepts three binary weighted address inputs (A0, A1, A2) and, depending on the state of these inputs, activates one of the eight outputs (Y0 through Y7). It is commonly used in memory addressing, data routing, and control logic applications. This device is part of the HC (High-speed CMOS) logic family, known for its high speed and low power consumption.

Applications

• Memory addressing: Selects memory locations in memory systems.
• Data routing: Routes data from one location to another based on address inputs.
• Control logic: Implements control functions based on address inputs.
• Peripheral selection: Selects one of several peripheral devices.
• Address decoding: Decodes address lines to enable specific devices or functions.

Features

• 3-to-8 line decoding: Decodes three address inputs into eight distinct outputs.
• High-speed operation: Provides fast switching speeds for high-performance applications.
• Low power consumption: Reduces power consumption in battery-powered devices.
• Wide operating voltage range: Operates from 2V to 6V.
• TTL compatible inputs: Interfaces easily with TTL logic devices.
• Enable inputs: Allows for cascading multiple devices to expand the number of outputs.
• DIP-16 and SOP-16 packages: Offers flexibility in mounting options.

Benefits

• Simplified circuit design: Reduces component count and simplifies logic functions.
• High performance: Enables fast and efficient operation.
• Low power consumption: Extends battery life in portable applications.
• Versatile applications: Suitable for a wide range of digital logic circuits.
• Easy to use: Simple pinout and straightforward functionality.

Additional Details

The NJU74HC238D operates with a supply voltage ranging from 2V to 6V. The propagation delay is typically in the nanosecond range, making it suitable for high-speed applications. The device features two enable inputs (E1 and E2) which, when both are active, allow the decoder to function normally. When either enable input is inactive, all outputs are forced to a high state. This feature allows for cascading multiple NJU74HC238D devices to create larger decoders. The TTL compatible inputs ensure that the device can be easily interfaced with TTL logic devices. The NJU74HC238D is available in both DIP-16 and SOP-16 packages, offering flexibility in mounting options. The high speed, low power consumption, and versatile applications make it a popular choice for digital logic design.