The UPD74HC239C is a high-speed silicon gate CMOS dual 2-to-4 line decoder/demultiplexer manufactured by NEC. This device belongs to the 74HC family, characterized by its low power consumption, high noise immunity, and fast switching speeds, making it suitable for a variety of digital logic applications.

Applications

• Memory address decoding: Used to select memory locations in memory systems.
• Peripheral selection: Employed to select specific peripheral devices in a system.
• Data routing: Utilized as a demultiplexer to route data from one line to one of several output lines.
• Control signal distribution: Used to distribute control signals to various parts of a system.
• Logic function implementation: Implemented in applications requiring decoding or demultiplexing functions in digital circuits.

Features

• Dual 2-to-4 line decoder/demultiplexer: Contains two independent 2-to-4 line decoders/demultiplexers in a single package.
• High-speed operation: Provides fast decoding and demultiplexing with typical propagation delays around 15 ns.
• Low power consumption: Operates with low static power consumption due to CMOS technology.
• Wide operating voltage range: Functions reliably over a broad voltage range, typically from 2V to 6V.
• High noise immunity: Offers excellent noise immunity, ensuring stable operation in noisy environments.
• Enable inputs: Each decoder/demultiplexer has its own enable input, allowing for independent control.

Benefits

• Versatile decoding/demultiplexing: Allows for the implementation of various decoding and demultiplexing functions.
• Fast signal processing: High-speed operation enables rapid decoding and signal routing.
• Energy efficient: Low power consumption reduces energy requirements and heat dissipation.
• Easy integration: Compatible with other TTL and CMOS logic devices, simplifying circuit design.
• Reliable performance: High noise immunity ensures reliable operation even in challenging conditions.

Additional Details

The UPD74HC239C typically comes in a 16-pin DIP or SOIC package. The device is pin-compatible with the 74HC239 and can be used as a direct replacement. Each decoder/demultiplexer has two address inputs (A and B) and an enable input (Ľ). When Ľ is low, the decoder/demultiplexer is enabled, and one of the four outputs (Y0, Y1, Y2, Y3) goes low depending on the state of the address inputs. When Ľ is high, all outputs are high. The device is suitable for various applications, including memory selection, data routing, and control signal distribution in digital systems.