SN74HCT138D

The SN74HCT138D is a high-speed 3-line to 8-line decoder/demultiplexer designed for memory decoding and data routing applications. It operates from a single supply voltage ranging from 4.5V to 5.5V, making it suitable for various digital systems.

This device features TTL-voltage compatible inputs and outputs that can drive up to 10 LSTTL loads. With a typical propagation delay of 17 ns and an output drive capability of ±4 mA at 5V, it ensures efficient signal transmission. The low input current of 1 µA maximum and low power consumption of 80 µA maximum ICC contribute to its energy efficiency.

The SN74HCT138D is available in a 16-SOIC surface-mount package, measuring 9.90 mm × 3.90 mm. Its design incorporates three enable inputs, which simplify cascading and data reception, making it a versatile component for complex logic designs.

This decoder/demultiplexer is ideal for applications requiring fast decoding and data selection, such as in memory systems where minimizing decoding delay is critical. Its ability to minimize system decoding effects when used with high-speed memories enhances overall system performance.