ON Semiconductor MC74ACT138 Decoder/Demultiplexer

The MC74ACT138 is a high-performance, integrated circuit designed by ON Semiconductor, renowned for its precision and reliability in digital systems. This particular device is a 3-to-8 line decoder/demultiplexer fabricated with silicon gate CMOS technology, which ensures its compatibility with the TTL logic families while maintaining the low power consumption and high noise immunity characteristic of CMOS integrated circuits.

Featuring three binary select inputs (A, B, and C), the MC74ACT138 can decode any combination of these inputs into one of eight mutually exclusive outputs. Each output can drive up to 15 LSTTL loads, which makes this component highly versatile for various applications. The device is equipped with three enable inputs, two active-low (E1 and E2) and one active-high (E3), which must all be satisfied to enable the device's decoding function. This multiple enable function allows for easy parallel expansion to a 1-of-24 decoder with just two MC74ACT138 ICs and one inverter.

ON Semiconductor's MC74ACT138 is designed for use in high-performance memory decoding or data-routing applications, requiring very short propagation delay times. It operates over a broad voltage range of 4.5V to 5.5V and provides a guaranteed noise margin of 1.5V. The device's demultiplexing capability also makes it useful for implementing complex logic functions.

The IC is available in multiple package options, including the 16-pin DIP (Dual In-line Package), SOIC (Small Outline Integrated Circuit), and TSSOP (Thin Shrink Small Outline Package), offering flexibility for various PCB (Printed Circuit Board) designs. The MC74ACT138 is also characterized for operation from -55°C to 125°C, ensuring reliability across a wide range of environmental conditions.

ON Semiconductor's commitment to quality ensures that the MC74ACT138 meets stringent standards, providing designers with confidence when incorporating this decoder/demultiplexer into their digital systems. Whether you're working on complex data routing, memory interfacing, or control logic, the MC74ACT138 offers a high-performance solution that integrates seamlessly into a wide array of electronic applications.