74HC138

The 74HC138 is a high-speed CMOS decoder integrated circuit. It accepts a three-bit binary weighted address on input pins A0, A1, and A2. When enabled, it produces one active low output while the remaining seven are high. The device features two active low enable inputs (E1, E2) and one active high enable input (E3). The disabled state results in all outputs being high.

Key specifications include a wide supply voltage range from 2.0 V to 6.0 V, low power dissipation, and high noise immunity. Typical propagation delay is 45 ns, with a maximum of 225 ns. The operating temperature range is -40 °C to +125 °C. The 74HC138 is suitable for applications such as memory chip select decoding, demultiplexing, and single-line peripheral control.

This component is ideal for designs requiring efficient address decoding or multiplexing capabilities. Its CMOS technology ensures low power consumption, making it suitable for battery-powered devices. The multiple enable inputs offer flexibility in system design and expansion.

The 74HC138 is available in various package options and is specified for operation across a broad temperature range, ensuring reliability in diverse environmental conditions.