NXP 74LVC138ADB 3-to-8 Line Decoder/Demultiplexer

The NXP 74LVC138ADB is a high-performance, low-voltage Silicon-Gate CMOS device that is superior to most advanced CMOS compatible TTL families. This 3-to-8 line decoder/demultiplexer is designed for use in high-performance memory decoding or data-routing applications requiring very short propagation delay times. In high-performance memory systems, this decoder can be used to minimize the effects of system decoding. When used as a demultiplexer, it takes a single input and selects one of eight output lines, which is a feature particularly useful in implementing hardware interrupts and multiplexing signals.

Key features of the 74LVC138ADB include:

• Logic Family: LVC
• Operating Voltage: 1.2V to 3.6V
• High Noise Immunity: Characterized for operation from -40°C to +85°C
• Low Power Consumption: 20 µA maximum ICC
• High-Speed: tpd of 4.5 ns at 3.3V
• Multiple Package Options: Including TSSOP16 and DHVQFN16

The device features three enable inputs (E1, E2, and E3), two of which are active low and one active high. This combination ensures flexibility in the control of the device, allowing for a variety of control schemes. The multiple enable inputs also facilitate the cascading of decoders, which is often required in more complex address decoding applications.

Each output can drive up to 50 ohm transmission lines near the rated supply voltage, providing the capability to drive heavily loaded outputs with high fan-out requirements. Additionally, the 74LVC138ADB is fully specified over the -40°C to +85°C temperature range, making it suitable for automotive and other temperature-sensitive applications.

The 74LVC138ADB is designed with the purpose of interfacing with the 5V systems. It has the capability to tolerate up to 5.5V at the input pins, allowing for direct interfacing with TTL logic levels. Its robust design and high-speed performance make it a suitable choice for a wide range of applications in modern electronics systems.

Overall, the NXP 74LVC138ADB is a versatile and reliable component that offers a balance of speed, power efficiency, and noise immunity, making it an excellent choice for system designers looking to optimize their decoding or demultiplexing applications.