The SN74LS138MEL from ON Semiconductor is a high-performance 3-to-8 line decoder/demultiplexer designed to facilitate the hardware management of chip select signals in digital systems. This integrated circuit (IC) is part of the 74LS logic family, known for its low power consumption and high-speed capabilities.

Key Features

• Logic Type: Decoder/Demultiplexer
• Logic Family: LS
• Number of Circuits: 1
• Number of Inputs: 3
• Number of Outputs: 8
• Output Type: Standard
• Supply Voltage Range: 4.75V to 5.25V
• Operating Temperature Range: -55°C to +125°C
• Package / Case: SOIC-16

Product Description

The SN74LS138MEL is optimized for use in high-performance memory-decoding or data-routing applications requiring very short propagation delay times. With three binary select inputs (A, B, and C) and eight mutually exclusive outputs (Y0 to Y7), the device provides a highly efficient solution for hardware design. When the enable inputs (G1, G2A, and G2B) are active low, the corresponding binary number appearing on the select inputs will cause a low level at the output.

This demultiplexer features inverting outputs and can be used as an 8-output demultiplexer by using one of the active-low enable inputs as the data input. The other enable inputs must be at their active low levels. Alternatively, it can decode a three-bit address to select one of eight active-low chip select lines for memory and port-mapped I/O.

With its standard output type, the SN74LS138MEL is capable of driving 10 LS-TTL loads. The IC's typical power dissipation is low, and it is specified for operation over a wide range of ambient temperatures, making it suitable for various industrial and commercial applications.

Encased in a compact SOIC-16 package, the SN74LS138MEL is designed for surface-mount technology (SMT), allowing for efficient use of PCB space and simplified assembly processes.

Applications

• Memory decoding
• Data routing
• Address decoding for memory and I/O
• Control systems
• Computer systems
• Embedded systems